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#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
using db = long double; // or double, if TL is tight
using str = string; // yay python!
 
using pi = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;
 
using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>; 
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>; 
using vpd = vector<pd>;
 
#define tcT template<class T
#define tcTU tcT, class U
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>; 
tcT, size_t SZ> using AR = array<T,SZ>; 
tcT> using PR = pair<T,T>;
 
// pairs
#define mp make_pair
#define f first
#define s second
 
// vectors
// oops size(x), rbegin(x), rend(x) need C++17
#define sz(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sor(x) sort(all(x)) 
#define rsz resize
#define ins insert 
#define ft front()
#define bk back()
#define pb push_back
#define eb emplace_back 
#define pf push_front
#define rtn return
 
#define lb lower_bound
#define ub upper_bound 
tcT> int lwb(V<T>& a, const T& b) { return int(lb(all(a),b)-bg(a)); }
 
// loops
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
 
const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5;
const ll INF = 1e18; // not too close to LLONG_MAX
const db PI = acos((db)-1);
const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1}; // for every grid problem!!
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 
template<class T> using pqg = priority_queue<T,vector<T>,greater<T>>;
 
// bitwise ops
// also see https://g...content-available-to-author-only...u.org/onlinedocs/gcc/Other-Builtins.html
constexpr int pct(int x) { return __builtin_popcount(x); } // # of bits set
constexpr int bits(int x) { // assert(x >= 0); // make C++11 compatible until USACO updates ...
	return x == 0 ? 0 : 31-__builtin_clz(x); } // floor(log2(x)) 
constexpr int p2(int x) { return 1<<x; }
constexpr int msk2(int x) { return p2(x)-1; }
 
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
 
tcT> bool ckmin(T& a, const T& b) {
	return b < a ? a = b, 1 : 0; } // set a = min(a,b)
tcT> bool ckmax(T& a, const T& b) {
	return a < b ? a = b, 1 : 0; }
 
tcTU> T fstTrue(T lo, T hi, U f) {
	hi ++; assert(lo <= hi); // assuming f is increasing
	while (lo < hi) { // find first index such that f is true 
		T mid = lo+(hi-lo)/2;
		f(mid) ? hi = mid : lo = mid+1; 
	} 
	return lo;
}
tcTU> T lstTrue(T lo, T hi, U f) {
	lo --; assert(lo <= hi); // assuming f is decreasing
	while (lo < hi) { // find first index such that f is true 
		T mid = lo+(hi-lo+1)/2;
		f(mid) ? lo = mid : hi = mid-1;
	} 
	return lo;
}
tcT> void remDup(vector<T>& v) { // sort and remove duplicates
	sort(all(v)); v.erase(unique(all(v)),end(v)); }
tcTU> void erase(T& t, const U& u) { // don't erase
	auto it = t.find(u); assert(it != end(t));
	t.erase(it); } // element that doesn't exist from (multi)set
 
#define tcTUU tcT, class ...U
 
inline namespace Helpers {
	//////////// is_iterable
	// https://stackoverflow.com/questions/13830158/check-if-a-variable-type-is-iterable
	// this gets used only when we can call begin() and end() on that type
	tcT, class = void> struct is_iterable : false_type {};
	tcT> struct is_iterable<T, void_t<decltype(begin(declval<T>())),
	                                  decltype(end(declval<T>()))
	                                 >
	                       > : true_type {};
	tcT> constexpr bool is_iterable_v = is_iterable<T>::value;
 
	//////////// is_readable
	tcT, class = void> struct is_readable : false_type {};
	tcT> struct is_readable<T,
	        typename std::enable_if_t<
	            is_same_v<decltype(cin >> declval<T&>()), istream&>
	        >
	    > : true_type {};
	tcT> constexpr bool is_readable_v = is_readable<T>::value;
 
	//////////// is_printable
	// // https://n...content-available-to-author-only...e.es/posts/2020-02-29-is-printable/
	tcT, class = void> struct is_printable : false_type {};
	tcT> struct is_printable<T,
	        typename std::enable_if_t<
	            is_same_v<decltype(cout << declval<T>()), ostream&>
	        >
	    > : true_type {};
	tcT> constexpr bool is_printable_v = is_printable<T>::value;
}
 
inline namespace Input {
	tcT> constexpr bool needs_input_v = !is_readable_v<T> && is_iterable_v<T>;
	tcTUU> void re(T& t, U&... u);
	tcTU> void re(pair<T,U>& p); // pairs
 
	// re: read
	tcT> typename enable_if<is_readable_v<T>,void>::type re(T& x) { cin >> x; } // default
	tcT> void re(complex<T>& c) { T a,b; re(a,b); c = {a,b}; } // complex
	tcT> typename enable_if<needs_input_v<T>,void>::type re(T& i); // ex. vectors, arrays
	tcTU> void re(pair<T,U>& p) { re(p.f,p.s); }
	tcT> typename enable_if<needs_input_v<T>,void>::type re(T& i) {
		each(x,i) re(x); }
	tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
 
	// rv: resize and read vectors
	void rv(size_t) {}
	tcTUU> void rv(size_t N, V<T>& t, U&... u);
	template<class...U> void rv(size_t, size_t N2, U&... u);
	tcTUU> void rv(size_t N, V<T>& t, U&... u) {
		t.rsz(N); re(t);
		rv(N,u...); }
	template<class...U> void rv(size_t, size_t N2, U&... u) {
		rv(N2,u...); }
 
	// dumb shortcuts to read in ints
	void decrement() {} // subtract one from each
	tcTUU> void decrement(T& t, U&... u) { --t; decrement(u...); }
	#define ints(...) int __VA_ARGS__; re(__VA_ARGS__);
	#define int1(...) ints(__VA_ARGS__); decrement(__VA_ARGS__);
}
 
inline namespace ToString {
	tcT> constexpr bool needs_output_v = !is_printable_v<T> && is_iterable_v<T>;
 
	// ts: string representation to print
	tcT> typename enable_if<is_printable_v<T>,str>::type ts(T v) {
		stringstream ss; ss << fixed << setprecision(15) << v;
		return ss.str(); } // default
	tcT> str bit_vec(T t) { // bit vector to string
		str res = "{"; F0R(i,sz(t)) res += ts(t[i]);
		res += "}"; return res; }
	str ts(V<bool> v) { return bit_vec(v); }
	template<size_t SZ> str ts(bitset<SZ> b) { return bit_vec(b); } // bit vector
	tcTU> str ts(pair<T,U> p); // pairs
	tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v); // vectors, arrays
	tcTU> str ts(pair<T,U> p) { return "("+ts(p.f)+", "+ts(p.s)+")"; }
	tcT> typename enable_if<is_iterable_v<T>,str>::type ts_sep(T v, str sep) {
		// convert container to string w/ separator sep
		bool fst = 1; str res = "";
		for (const auto& x: v) {
			if (!fst) res += sep;
			fst = 0; res += ts(x);
		}
		return res;
	}
	tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v) {
		return "{"+ts_sep(v,", ")+"}"; }
 
	// for nested DS
	template<int, class T> typename enable_if<!needs_output_v<T>,vs>::type 
	  ts_lev(const T& v) { return {ts(v)}; }
	template<int lev, class T> typename enable_if<needs_output_v<T>,vs>::type 
	  ts_lev(const T& v) {
		if (lev == 0 || !sz(v)) return {ts(v)};
		vs res;
		for (const auto& t: v) {
			if (sz(res)) res.bk += ",";
			vs tmp = ts_lev<lev-1>(t);
			res.ins(end(res),all(tmp));
		}
		F0R(i,sz(res)) {
			str bef = " "; if (i == 0) bef = "{";
			res[i] = bef+res[i];
		}
		res.bk += "}";
		return res;
	}
}
 
inline namespace Output {
	template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
	template<class T, class... U> void pr_sep(ostream& os, str sep, const T& t, const U&... u) {
		pr_sep(os,sep,t); os << sep; pr_sep(os,sep,u...); }
	// print w/ no spaces
	template<class ...T> void pr(const T&... t) { pr_sep(cout,"",t...); } 
	// print w/ spaces, end with newline
	void ps() { cout << "\n"; }
	template<class ...T> void ps(const T&... t) { pr_sep(cout," ",t...); ps(); } 
	// debug to cerr
	template<class ...T> void dbg_out(const T&... t) {
		pr_sep(cerr," | ",t...); cerr << endl; }
	void loc_info(int line, str names) {
		cerr << "Line(" << line << ") -> [" << names << "]: "; }
	template<int lev, class T> void dbgl_out(const T& t) {
		cerr << "\n\n" << ts_sep(ts_lev<lev>(t),"\n") << "\n" << endl; }
	#ifdef LOCAL
		#define dbg(...) loc_info(__LINE__,#__VA_ARGS__), dbg_out(__VA_ARGS__)
		#define dbgl(lev,x) loc_info(__LINE__,#x), dbgl_out<lev>(x)
	#else // don't actually submit with this
		#define dbg(...) 0
		#define dbgl(lev,x) 0
	#endif
}
 
inline namespace FileIO {
	void setIn(str s)  { freopen(s.c_str(),"r",stdin); }
	void setOut(str s) { freopen(s.c_str(),"w",stdout); }
	void setIO(str s = "") {
		cin.tie(0)->sync_with_stdio(0); // unsync C / C++ I/O streams
		// cin.exceptions(cin.failbit);
		// throws exception when do smth illegal
		// ex. try to read letter into int
		if (sz(s)) setIn(s+".in"), setOut(s+".out"); // for old USACO
	}
}
 
// make sure to intialize ALL GLOBAL VARS between tcs!
 
clock_t beg = clock();
 
/**
 * Description: half-plane intersection area
 * Time: O(N\log N)
 * Source: Own
 	* http://w...content-available-to-author-only...d.edu/class/spring2020/cmsc754/Lects/lect06-duality.pdf might be of interest
 * Verification:
	* https://o...content-available-to-author-only...s.com/problems/bigbrother 
	* (planes through two points with integer coordinates <= 10^7)
 */
 
/**
 * Description: Use in place of \texttt{complex<T>}.
 * Source: http://c...content-available-to-author-only...s.com/blog/entry/22175, KACTL
 * Verification: various
 */
 
using T = db; // or long long
const T EPS = 1e-12; // might want to change
using P = pair<T,T>; using vP = V<P>; using Line = pair<P,P>;
int sgn(T a) { return (a>EPS)-(a<-EPS); }
T sq(T a) { return a*a; }
 
bool close(const P& a, const P& b) { 
	return sgn(a.f-b.f) == 0 && sgn(a.s-b.s) == 0; } 
T norm(const P& p) { return sq(p.f)+sq(p.s); }
T abs(const P& p) { return sqrt(norm(p)); }
T arg(const P& p) { return atan2(p.s,p.f); }
P conj(const P& p) { return P(p.f,-p.s); }
P perp(const P& p) { return P(-p.s,p.f); }
P dir(T ang) { return P(cos(ang),sin(ang)); }
 
P operator-(const P& l) { return P(-l.f,-l.s); }
P operator+(const P& l, const P& r) { 
	return P(l.f+r.f,l.s+r.s); }
P operator-(const P& l, const P& r) { 
	return P(l.f-r.f,l.s-r.s); }
P operator*(const P& l, const T& r) { 
	return P(l.f*r,l.s*r); }
P operator*(const T& l, const P& r) { return r*l; }
P operator/(const P& l, const T& r) { 
	return P(l.f/r,l.s/r); }
P operator*(const P& l, const P& r) { 
	return P(l.f*r.f-l.s*r.s,l.s*r.f+l.f*r.s); }
P operator/(const P& l, const P& r) { 
	return l*conj(r)/norm(r); }
P& operator+=(P& l, const P& r) { return l = l+r; }
P& operator-=(P& l, const P& r) { return l = l-r; }
P& operator*=(P& l, const T& r) { return l = l*r; }
P& operator/=(P& l, const T& r) { return l = l/r; }
P& operator*=(P& l, const P& r) { return l = l*r; }
P& operator/=(P& l, const P& r) { return l = l/r; }
 
P unit(const P& p) { return p/abs(p); }
T dot(const P& a, const P& b) { return a.f*b.f+a.s*b.s; }
T cross(const P& a, const P& b) { return a.f*b.s-a.s*b.f; }
T cross(const P& p, const P& a, const P& b) {
	return cross(a-p,b-p); }
P reflect(const P& p, const Line& l) { 
	P a = l.f, d = l.s-l.f;
	return a+conj((p-a)/d)*d; }
P foot(const P& p, const Line& l) { 
	return (p+reflect(p,l))/(T)2; }
bool p_on_seg(const P& p, const Line& l) {
	return sgn(cross(l.f,l.s,p)) == 0 && sgn(dot(p-l.f,p-l.s)) <= 0; }
 
using Half = AR<T,3>; // half-plane
using vH = V<Half>;
P hp_point(const Half& h) { return {h[0],h[1]}; } // direction of half-plane
P isect(const Half& h0, const Half& h1) { // Cramer's rule to intersect half-planes
	AR<T,3> vals;
	FOR(i,-1,2) {
		int x = (i == 0 ? 2 : 0), y = (i == 1 ? 2 : 1);
		vals[1+i] = h0[x]*h1[y]-h0[y]*h1[x];
	}
	assert(vals[0] != 0); return {vals[1]/vals[0],vals[2]/vals[0]};
}
T eval(const Half& h, T x) { assert(h[1] != 0); // evaluate half-plane at x-coordinate
	return (h[2]-h[0]*x)/h[1]; }
T x_isect(const Half& h0, const Half& h1) { return isect(h0,h1).f; } // x-coordinate of intersection
 
vH construct_lower(P x, vH planes) { // similar to convex hull (by duality)
	sort(all(planes),[](const Half& a, const Half& b) {
		return cross(hp_point(a),hp_point(b)) > 0; });
	vH res{{1,0,x.f}}; // >= x.f
	planes.pb({-1,0,-x.s}); // <= x.s
	auto lst_x = [&](Half a, Half b) {
		if (abs(cross(hp_point(a),hp_point(b))) == 0) // parallel half-planes, remove lower one
			return a[2]/a[1] <= b[2]/b[1] ? x.f : x.s;
		return x_isect(a,b);
	};
	each(t,planes) {
		while (sz(res) > 1 && lst_x(res.bk,t) <= lst_x(end(res)[-2],res.bk))
			res.pop_back();
		res.pb(t);
	}
	return res;
}
 
T isect_area(vH planes) {
	const T BIG = 1e9; P x{-BIG,BIG};
	planes.pb({0,1,-BIG}); // y >= -BIG
	planes.pb({0,-1,-BIG}); // -y >= -BIG
	vH upper, lower;
	each(t,planes) {
		if (t[1] == 0) { // vertical line
			T quo = t[2]/t[0];
			if (t[0] > 0) ckmax(x.f,quo);
			else ckmin(x.s,quo); // -x >=
		} else if (t[1] > 0) lower.pb(t);
		else upper.pb(t);
	}
	if (x.f >= x.s) return 0;
	lower = construct_lower(x,lower);
 
	each(t,upper) t[0] *= -1, t[1] *= -1; 
	upper = construct_lower({-x.s,-x.f},upper);
	each(t,upper) t[0] *= -1, t[1] *= -1;
	reverse(all(upper));
	int iu = 1, il = 1;
	T lst = x.f, lst_dif = eval(upper[1],lst)-eval(lower[1],lst);
	T ans = 0;
	while (iu < sz(upper)-1 && il < sz(lower)-1) { // sweep vertical line through lower and upper hulls
		T nex_upper = x_isect(upper[iu],upper[iu+1]);
		T nex_lower = x_isect(lower[il],lower[il+1]);
		T nex = min(nex_upper,nex_lower);
		T nex_dif = eval(upper[iu],nex)-eval(lower[il],nex);
		auto avg_val = [](T a, T b) -> T {
			if (a > b) swap(a,b);
			if (b <= 0) return 0;
			if (a >= 0) return (a+b)/2;
			return b/(b-a)*b/2;
		};
		ans += (nex-lst)*avg_val(lst_dif,nex_dif);
		assert(x.f <= nex && nex <= x.s);
		lst = nex, lst_dif = nex_dif;
		iu += lst == nex_upper;
		il += lst == nex_lower;
	}
	return ans;
}
 
Half plane_right(P a, P b) { // half-plane to right of a -> b
	return {b.s-a.s,a.f-b.f,(b.s-a.s)*a.f+(a.f-b.f)*a.s}; }
Half plane_through(P p, P dir) { // half-plane through p in direction dir
	return {dir.f,dir.s,dot(p,dir)}; }
 
int N;
 
void solve(int tc) {
	// cerr << "Doing TC #" << tc << " " << (db)(clock()-beg)/CLOCKS_PER_SEC << "\n";
	re(N);
	vH planes;
	rep(N) {
		db m,q; re(m,q);
		P st = P(0,q);
		P dir = P(-m,1);
		if (dot(st,dir) > 0) {
			planes.pb(plane_through(st,-dir));
		} else {
			planes.pb(plane_through(st,dir));
		}
	}
	db ans = isect_area(planes);
	// cout << ans << "\n";
	if (ans > 204098193) {
		// cerr << "OOPS" << scientific << ans << "\n";
		cout << fixed << setprecision(15) << "inf" << "\n";
	} else {
		cout << fixed << setprecision(15) << isect_area(planes) << "\n";
	}
}
 
int main() {
	setIO();
	int TC; re(TC);
	FOR(i,1,TC+1) {
		pr("Case #",i,": ");
		solve(i);
	}
}
 
/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1?)
	* do smth instead of nothing and stay organized
	* WRITE STUFF DOWN
	* DON'T GET STUCK ON ONE APPROACH
*/
 

prog.cpp:124:14: error: ‘is_same_v’ was not declared in this scope
              is_same_v<decltype(cin >> declval<T&>()), istream&>
              ^~~~~~~~~
prog.cpp:124:14: note: suggested alternative: ‘iswspace_l’
              is_same_v<decltype(cin >> declval<T&>()), istream&>
              ^~~~~~~~~
              iswspace_l
prog.cpp:124:64: error: template argument 1 is invalid
              is_same_v<decltype(cin >> declval<T&>()), istream&>
                                                                ^
prog.cpp:125:10: error: template argument 2 is invalid
          >
          ^
prog.cpp:126:6: error: expected unqualified-id before ‘>’ token
      > : true_type {};
      ^
prog.cpp:134:14: error: ‘is_same_v’ was not declared in this scope
              is_same_v<decltype(cout << declval<T>()), ostream&>
              ^~~~~~~~~
prog.cpp:134:14: note: suggested alternative: ‘iswspace_l’
              is_same_v<decltype(cout << declval<T>()), ostream&>
              ^~~~~~~~~
              iswspace_l
prog.cpp:134:64: error: template argument 1 is invalid
              is_same_v<decltype(cout << declval<T>()), ostream&>
                                                                ^
prog.cpp:135:10: error: template argument 2 is invalid
          >
          ^
prog.cpp:136:6: error: expected unqualified-id before ‘>’ token
      > : true_type {};
      ^
prog.cpp: In instantiation of ‘str ToString::bit_vec(T) [with T = std::vector<bool>; str = std::__cxx11::basic_string<char>]’:
prog.cpp:181:38:   required from here
prog.cpp:179:40: error: no matching function for call to ‘ts(std::vector<bool>::reference)’
   str res = "{"; F0R(i,sz(t)) res += ts(t[i]);
                                      ~~^~~~~~
prog.cpp:175:55: note: candidate: ‘template<class T> typename std::enable_if<is_printable_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T)’
  tcT> typename enable_if<is_printable_v<T>,str>::type ts(T v) {
                                                       ^~
prog.cpp:175:55: note:   template argument deduction/substitution failed:
prog.cpp: In substitution of ‘template<class T> typename std::enable_if<is_printable_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T) [with T = std::_Bit_reference]’:
prog.cpp:179:40:   required from ‘str ToString::bit_vec(T) [with T = std::vector<bool>; str = std::__cxx11::basic_string<char>]’
prog.cpp:181:38:   required from here
prog.cpp:175:55: error: no type named ‘type’ in ‘struct std::enable_if<false, std::__cxx11::basic_string<char> >’
prog.cpp: In instantiation of ‘void Input::re(T&, U& ...) [with T = int; U = {}]’:
prog.cpp:410:6:   required from here
prog.cpp:152:43: error: no matching function for call to ‘re()’
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:152:14: note: candidate: ‘template<class T, class ... U> void Input::re(T&, U& ...)’
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
              ^~
prog.cpp:152:14: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects at least 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:149:13: note: candidate: ‘template<class T, class U> void Input::re(std::pair<_T1, _T2>&)’
  tcTU> void re(pair<T,U>& p) { re(p.f,p.s); }
             ^~
prog.cpp:149:13: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:146:55: note: candidate: ‘template<class T> typename std::enable_if<is_readable_v<T>, void>::type Input::re(T&)’
  tcT> typename enable_if<is_readable_v<T>,void>::type re(T& x) { cin >> x; } // default
                                                       ^~
prog.cpp:146:55: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:147:12: note: candidate: ‘template<class T> void Input::re(std::complex<_Tp>&)’
  tcT> void re(complex<T>& c) { T a,b; re(a,b); c = {a,b}; } // complex
            ^~
prog.cpp:147:12: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:150:55: note: candidate: ‘template<class T> typename std::enable_if<needs_input_v<T>, void>::type Input::re(T&)’
  tcT> typename enable_if<needs_input_v<T>,void>::type re(T& i) {
                                                       ^~
prog.cpp:150:55: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp: In instantiation of ‘void Input::re(T&, U& ...) [with T = long double; U = {}]’:
prog.cpp:152:36:   required from ‘void Input::re(T&, U& ...) [with T = long double; U = {long double}]’
prog.cpp:413:17:   required from here
prog.cpp:152:43: error: no matching function for call to ‘re()’
prog.cpp:152:14: note: candidate: ‘template<class T, class ... U> void Input::re(T&, U& ...)’
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
              ^~
prog.cpp:152:14: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects at least 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:149:13: note: candidate: ‘template<class T, class U> void Input::re(std::pair<_T1, _T2>&)’
  tcTU> void re(pair<T,U>& p) { re(p.f,p.s); }
             ^~
prog.cpp:149:13: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:146:55: note: candidate: ‘template<class T> typename std::enable_if<is_readable_v<T>, void>::type Input::re(T&)’
  tcT> typename enable_if<is_readable_v<T>,void>::type re(T& x) { cin >> x; } // default
                                                       ^~
prog.cpp:146:55: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:147:12: note: candidate: ‘template<class T> void Input::re(std::complex<_Tp>&)’
  tcT> void re(complex<T>& c) { T a,b; re(a,b); c = {a,b}; } // complex
            ^~
prog.cpp:147:12: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp:150:55: note: candidate: ‘template<class T> typename std::enable_if<needs_input_v<T>, void>::type Input::re(T&)’
  tcT> typename enable_if<needs_input_v<T>,void>::type re(T& i) {
                                                       ^~
prog.cpp:150:55: note:   template argument deduction/substitution failed:
prog.cpp:152:43: note:   candidate expects 1 argument, 0 provided
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
                                         ~~^~~~~~
prog.cpp: In instantiation of ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = char [7]; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’:
prog.cpp:222:9:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:220:72: error: no matching function for call to ‘ts(const char [7])’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:175:55: note: candidate: ‘template<class T> typename std::enable_if<is_printable_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T)’
  tcT> typename enable_if<is_printable_v<T>,str>::type ts(T v) {
                                                       ^~
prog.cpp:175:55: note:   template argument deduction/substitution failed:
prog.cpp: In substitution of ‘template<class T> typename std::enable_if<is_printable_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T) [with T = const char*]’:
prog.cpp:220:72:   required from ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = char [7]; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:9:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:175:55: error: no type named ‘type’ in ‘struct std::enable_if<false, std::__cxx11::basic_string<char> >’
prog.cpp: In instantiation of ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = char [7]; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’:
prog.cpp:222:9:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:181:6: note: candidate: ‘str ToString::ts(V<bool>)’
  str ts(V<bool> v) { return bit_vec(v); }
      ^~
prog.cpp:181:6: note:   no known conversion for argument 1 from ‘const char [7]’ to ‘V<bool>’ {aka ‘std::vector<bool>’}
prog.cpp:182:26: note: candidate: ‘template<long unsigned int SZ> str ToString::ts(std::bitset<_Nb>)’
  template<size_t SZ> str ts(bitset<SZ> b) { return bit_vec(b); } // bit vector
                          ^~
prog.cpp:182:26: note:   template argument deduction/substitution failed:
prog.cpp:220:72: note:   mismatched types ‘std::bitset<_Nb>’ and ‘const char*’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:185:12: note: candidate: ‘template<class T, class U> str ToString::ts(std::pair<_T1, _T2>)’
  tcTU> str ts(pair<T,U> p) { return "("+ts(p.f)+", "+ts(p.s)+")"; }
            ^~
prog.cpp:185:12: note:   template argument deduction/substitution failed:
prog.cpp:220:72: note:   mismatched types ‘std::pair<_T1, _T2>’ and ‘const char*’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:195:55: note: candidate: ‘template<class T> typename std::enable_if<needs_output_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T)’
  tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v) {
                                                       ^~
prog.cpp:195:55: note:   template argument deduction/substitution failed:
prog.cpp: In substitution of ‘template<class T> typename std::enable_if<needs_output_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T) [with T = const char*]’:
prog.cpp:220:72:   required from ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = char [7]; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:9:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:195:55: error: no type named ‘type’ in ‘struct std::enable_if<false, std::__cxx11::basic_string<char> >’
prog.cpp: In instantiation of ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = int; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’:
prog.cpp:222:9:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = int; U = {char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:38:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:220:72: error: no matching function for call to ‘ts(const int&)’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:175:55: note: candidate: ‘template<class T> typename std::enable_if<is_printable_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T)’
  tcT> typename enable_if<is_printable_v<T>,str>::type ts(T v) {
                                                       ^~
prog.cpp:175:55: note:   template argument deduction/substitution failed:
prog.cpp: In substitution of ‘template<class T> typename std::enable_if<is_printable_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T) [with T = int]’:
prog.cpp:220:72:   required from ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = int; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:9:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = int; U = {char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:38:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:175:55: error: no type named ‘type’ in ‘struct std::enable_if<false, std::__cxx11::basic_string<char> >’
prog.cpp: In instantiation of ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = int; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’:
prog.cpp:222:9:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = int; U = {char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:38:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:181:6: note: candidate: ‘str ToString::ts(V<bool>)’
  str ts(V<bool> v) { return bit_vec(v); }
      ^~
prog.cpp:181:6: note:   no known conversion for argument 1 from ‘const int’ to ‘V<bool>’ {aka ‘std::vector<bool>’}
prog.cpp:182:26: note: candidate: ‘template<long unsigned int SZ> str ToString::ts(std::bitset<_Nb>)’
  template<size_t SZ> str ts(bitset<SZ> b) { return bit_vec(b); } // bit vector
                          ^~
prog.cpp:182:26: note:   template argument deduction/substitution failed:
prog.cpp:220:72: note:   mismatched types ‘std::bitset<_Nb>’ and ‘int’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:185:12: note: candidate: ‘template<class T, class U> str ToString::ts(std::pair<_T1, _T2>)’
  tcTU> str ts(pair<T,U> p) { return "("+ts(p.f)+", "+ts(p.s)+")"; }
            ^~
prog.cpp:185:12: note:   template argument deduction/substitution failed:
prog.cpp:220:72: note:   mismatched types ‘std::pair<_T1, _T2>’ and ‘int’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:195:55: note: candidate: ‘template<class T> typename std::enable_if<needs_output_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T)’
  tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v) {
                                                       ^~
prog.cpp:195:55: note:   template argument deduction/substitution failed:
prog.cpp: In substitution of ‘template<class T> typename std::enable_if<needs_output_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T) [with T = int]’:
prog.cpp:220:72:   required from ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = int; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:9:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = int; U = {char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:38:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:195:55: error: no type named ‘type’ in ‘struct std::enable_if<false, std::__cxx11::basic_string<char> >’
prog.cpp: In instantiation of ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = char [3]; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’:
prog.cpp:222:38:   recursively required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = int; U = {char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:38:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:220:72: error: no matching function for call to ‘ts(const char [3])’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:175:55: note: candidate: ‘template<class T> typename std::enable_if<is_printable_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T)’
  tcT> typename enable_if<is_printable_v<T>,str>::type ts(T v) {
                                                       ^~
prog.cpp:175:55: note:   template argument deduction/substitution failed:
prog.cpp: In substitution of ‘template<class T> typename std::enable_if<is_printable_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T) [with T = const char*]’:
prog.cpp:222:38:   recursively required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = int; U = {char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:38:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:175:55: error: no type named ‘type’ in ‘struct std::enable_if<false, std::__cxx11::basic_string<char> >’
prog.cpp: In instantiation of ‘void Output::pr_sep(std::ostream&, str, const T&) [with T = char [3]; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’:
prog.cpp:222:38:   recursively required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = int; U = {char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:38:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:181:6: note: candidate: ‘str ToString::ts(V<bool>)’
  str ts(V<bool> v) { return bit_vec(v); }
      ^~
prog.cpp:181:6: note:   no known conversion for argument 1 from ‘const char [3]’ to ‘V<bool>’ {aka ‘std::vector<bool>’}
prog.cpp:182:26: note: candidate: ‘template<long unsigned int SZ> str ToString::ts(std::bitset<_Nb>)’
  template<size_t SZ> str ts(bitset<SZ> b) { return bit_vec(b); } // bit vector
                          ^~
prog.cpp:182:26: note:   template argument deduction/substitution failed:
prog.cpp:220:72: note:   mismatched types ‘std::bitset<_Nb>’ and ‘const char*’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:185:12: note: candidate: ‘template<class T, class U> str ToString::ts(std::pair<_T1, _T2>)’
  tcTU> str ts(pair<T,U> p) { return "("+ts(p.f)+", "+ts(p.s)+")"; }
            ^~
prog.cpp:185:12: note:   template argument deduction/substitution failed:
prog.cpp:220:72: note:   mismatched types ‘std::pair<_T1, _T2>’ and ‘const char*’
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
                                                                      ~~^~~
prog.cpp:195:55: note: candidate: ‘template<class T> typename std::enable_if<needs_output_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T)’
  tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v) {
                                                       ^~
prog.cpp:195:55: note:   template argument deduction/substitution failed:
prog.cpp: In substitution of ‘template<class T> typename std::enable_if<needs_output_v<T>, std::__cxx11::basic_string<char> >::type ToString::ts(T) [with T = const char*]’:
prog.cpp:222:38:   recursively required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = int; U = {char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:222:38:   required from ‘void Output::pr_sep(std::ostream&, str, const T&, const U& ...) [with T = char [7]; U = {int, char [3]}; std::ostream = std::basic_ostream<char>; str = std::__cxx11::basic_string<char>]’
prog.cpp:224:54:   required from ‘void Output::pr(const T& ...) [with T = {char [7], int, char [3]}]’
prog.cpp:436:21:   required from here
prog.cpp:195:55: error: no type named ‘type’ in ‘struct std::enable_if<false, std::__cxx11::basic_string<char> >’
prog.cpp: In function ‘void FileIO::setIn(str)’:
prog.cpp:245:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
  void setIn(str s)  { freopen(s.c_str(),"r",stdin); }
                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
prog.cpp: In function ‘void FileIO::setOut(str)’:
prog.cpp:246:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
  void setOut(str s) { freopen(s.c_str(),"w",stdout); }
                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Standard output is empty