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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5. typedef long double ld;
  6. typedef double db; 
  7. typedef string str; 
  8.  
  9. typedef pair<int,int> pi;
  10. typedef pair<ll,ll> pl; 
  11. typedef pair<db,db> pd; 
  12.  
  13. typedef vector<int> vi; 
  14. typedef vector<bool> vb; 
  15. typedef vector<ll> vl; 
  16. typedef vector<db> vd; 
  17. typedef vector<str> vs; 
  18. typedef vector<pi> vpi;
  19. typedef vector<pl> vpl; 
  20. typedef vector<pd> vpd; 
  21. template<class T> using V = vector<T>; 
  22. template<class T, size_t SZ> using AR = array<T,SZ>; 
  23.  
  24. #define mp make_pair
  25. #define f first
  26. #define s second
  27. #define sz(x) (int)(x).size()
  28. #define all(x) begin(x), end(x)
  29. #define rall(x) (x).rbegin(), (x).rend() 
  30. #define sor(x) sort(all(x)) 
  31. #define rsz resize
  32. #define ins insert 
  33. #define ft front() 
  34. #define bk back()
  35. #define pf push_front 
  36. #define pb push_back
  37. #define eb emplace_back 
  38. #define lb lower_bound 
  39. #define ub upper_bound 
  40.  
  41. #define FOR(i,a,b) for (int i = (a); i < (b); ++i)
  42. #define F0R(i,a) FOR(i,0,a)
  43. #define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
  44. #define R0F(i,a) ROF(i,0,a)
  45. #define trav(a,x) for (auto& a: x)
  46.  
  47. const int MOD = 1e9+7; // 998244353;
  48. const int MX = 2e5+5; 
  49. const ll INF = 1e18; 
  50. const ld PI = acos((ld)-1);
  51. const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1}; 
  52. mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 
  53.  
  54. template<class T> bool ckmin(T& a, const T& b) { 
  55. 	return b < a ? a = b, 1 : 0; }
  56. template<class T> bool ckmax(T& a, const T& b) { 
  57. 	return a < b ? a = b, 1 : 0; } 
  58. constexpr int pct(int x) { return __builtin_popcount(x); } 
  59. constexpr int bits(int x) { return 31-__builtin_clz(x); } // floor(log2(x)) 
  60. ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
  61. ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
  62. ll half(ll x) { return fdiv(x,2); }
  63.  
  64. template<class T, class U> T fstTrue(T lo, T hi, U f) { 
  65. 	// note: if (lo+hi)/2 is used instead of half(lo+hi) then this will loop infinitely when lo=hi
  66. 	hi ++; assert(lo <= hi); // assuming f is increasing
  67. 	while (lo < hi) { // find first index such that f is true 
  68. 		T mid = half(lo+hi);
  69. 		f(mid) ? hi = mid : lo = mid+1; 
  70. 	} 
  71. 	return lo;
  72. }
  73. template<class T, class U> T lstTrue(T lo, T hi, U f) {
  74. 	lo --; assert(lo <= hi); // assuming f is decreasing
  75. 	while (lo < hi) { // find first index such that f is true 
  76. 		T mid = half(lo+hi+1);
  77. 		f(mid) ? lo = mid : hi = mid-1;
  78. 	} 
  79. 	return lo;
  80. }
  81. template<class T> void remDup(vector<T>& v) { 
  82. 	sort(all(v)); v.erase(unique(all(v)),end(v)); }
  83.  
  84. // INPUT
  85. template<class A> void re(complex<A>& c);
  86. template<class A, class B> void re(pair<A,B>& p);
  87. template<class A> void re(vector<A>& v);
  88. template<class A, size_t SZ> void re(array<A,SZ>& a);
  89.  
  90. template<class T> void re(T& x) { cin >> x; }
  91. void re(db& d) { str t; re(t); d = stod(t); }
  92. void re(ld& d) { str t; re(t); d = stold(t); }
  93. template<class H, class... T> void re(H& h, T&... t) { re(h); re(t...); }
  94.  
  95. template<class A> void re(complex<A>& c) { A a,b; re(a,b); c = {a,b}; }
  96. template<class A, class B> void re(pair<A,B>& p) { re(p.f,p.s); }
  97. template<class A> void re(vector<A>& x) { trav(a,x) re(a); }
  98. template<class A, size_t SZ> void re(array<A,SZ>& x) { trav(a,x) re(a); }
  99.  
  100. // TO_STRING
  101. #define ts to_string
  102. str ts(char c) { return str(1,c); }
  103. str ts(const char* s) { return (str)s; }
  104. str ts(str s) { return s; }
  105. str ts(bool b) { 
  106. 	#ifdef LOCAL
  107. 		return b ? "true" : "false"; 
  108. 	#else 
  109. 		return ts((int)b);
  110. 	#endif
  111. }
  112. template<class A> str ts(complex<A> c) { 
  113. 	stringstream ss; ss << c; return ss.str(); }
  114. str ts(vector<bool> v) {
  115. 	str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]);
  116. 	res += "}"; return res; }
  117. template<size_t SZ> str ts(bitset<SZ> b) {
  118. 	str res = ""; F0R(i,SZ) res += char('0'+b[i]);
  119. 	return res; }
  120. template<class A, class B> str ts(pair<A,B> p);
  121. template<class T> str ts(T v) { // containers with begin(), end()
  122. 	#ifdef LOCAL
  123. 		bool fst = 1; str res = "{";
  124. 		for (const auto& x: v) {
  125. 			if (!fst) res += ", ";
  126. 			fst = 0; res += ts(x);
  127. 		}
  128. 		res += "}"; return res;
  129. 	#else
  130. 		bool fst = 1; str res = "";
  131. 		for (const auto& x: v) {
  132. 			if (!fst) res += " ";
  133. 			fst = 0; res += ts(x);
  134. 		}
  135. 		return res;
  136.  
  137. 	#endif
  138. }
  139. template<class A, class B> str ts(pair<A,B> p) {
  140. 	#ifdef LOCAL
  141. 		return "("+ts(p.f)+", "+ts(p.s)+")"; 
  142. 	#else
  143. 		return ts(p.f)+" "+ts(p.s);
  144. 	#endif
  145. }
  146.  
  147. // OUTPUT
  148. template<class A> void pr(A x) { cout << ts(x); }
  149. template<class H, class... T> void pr(const H& h, const T&... t) { 
  150. 	pr(h); pr(t...); }
  151. void ps() { cout << endl; } // print w/ spaces
  152. template<class H, class... T> void ps(const H& h, const T&... t) { 
  153. 	pr(h); if (sizeof...(t)) pr(" "); ps(t...); }
  154.  
  155. // DEBUG
  156. void DBG() { cerr << "]" << endl; }
  157. template<class H, class... T> void DBG(H h, T... t) {
  158. 	cerr << ts(h); if (sizeof...(t)) cerr << ", ";
  159. 	DBG(t...); }
  160. #ifdef LOCAL // compile with -DLOCAL, chk -> fake assert
  161. 	#define dbg(...) cerr << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
  162. 	#define chk(...) if (!(__VA_ARGS__)) cerr << "Line(" << __LINE__ << ") -> function(" \
  163. 		 << __FUNCTION__  << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0);
  164. #else
  165. 	#define dbg(...) 0
  166. 	#define chk(...) 0
  167. #endif
  168.  
  169. // FILE I/O
  170. void setIn(str s) { freopen(s.c_str(),"r",stdin); }
  171. void setOut(str s) { freopen(s.c_str(),"w",stdout); }
  172. void unsyncIO() { cin.tie(0)->sync_with_stdio(0); }
  173. void setIO(str s = "") {
  174. 	unsyncIO();
  175. 	// cin.exceptions(cin.failbit); 
  176. 	// throws exception when do smth illegal
  177. 	// ex. try to read letter into int
  178. 	if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
  179. }
  180.  
  181. int N,D,U,Q;
  182. vi H;
  183. set<int> cur[MX], lst[MX]; // OK
  184. V<AR<int,3>> mod[MX]; // OK
  185.  
  186. vector<vi> stor[MX];
  187. V<V<AR<int,3>>> mods[MX];
  188. V<vi> h[MX];
  189.  
  190. vi vals(int x, int ti) { // get friends of x at time ti
  191. 	// in O(D+U/D) time (assume D=500)
  192. 	int ind = 0;
  193. 	while (ind+1 < sz(mods[x]) && mods[x][ind].bk[0] <= ti) ind ++; 
  194. 	// oops this is U/D time lol, can replace with log(U/D) binsearch
  195. 	trav(t,mods[x][ind]) if (t[0] <= ti)
  196. 		stor[x][ind][t[1]] += t[2];
  197. 	vi ans;
  198. 	F0R(i,sz(h[x][ind])) if (stor[x][ind][i]) ans.pb(h[x][ind][i]);
  199. 	trav(t,mods[x][ind]) if (t[0] <= ti)
  200. 		stor[x][ind][t[1]] -= t[2];
  201. 	return ans;
  202. }
  203.  
  204. void deal(int x) {
  205. 	h[x].eb(); stor[x].eb(), mods[x].eb();
  206. 	vi& v = h[x].bk;
  207. 	trav(t,lst[x]) v.pb(H[t]);
  208. 	trav(t,mod[x]) v.pb(H[t[1]]);
  209. 	remDup(v);
  210. 	auto ind = [&](int x) -> int {
  211. 		auto it = lb(all(v),H[x]);
  212. 		return it-begin(v);
  213. 	};
  214. 	stor[x].bk.rsz(sz(v));
  215. 	trav(t,lst[x]) stor[x].bk[ind(t)] ++;
  216. 	lst[x] = cur[x];
  217. 	trav(t,mod[x]) t[1] = ind(t[1]);
  218. 	swap(mods[x].bk,mod[x]);
  219. }
  220.  
  221. void ins(int x, int y, int ti) {
  222. 	if (cur[x].count(y)) {
  223. 		cur[x].erase(y);
  224. 		mod[x].pb({ti,y,-1});
  225. 	} else {
  226. 		cur[x].ins(y);
  227. 		mod[x].pb({ti,y,1});
  228. 	}
  229. 	if (sz(mod[x]) == D) deal(x); // a lot of updates happened, save the current state
  230. }
  231.  
  232. int main() {
  233. 	setIO(); re(N,D,U,Q);
  234. 	H.rsz(N); re(H);
  235. 	FOR(i,1,U+1) {
  236. 		int A,B; re(A,B);
  237. 		ins(A,B,i), ins(B,A,i);
  238. 	}
  239. 	F0R(i,N) deal(i);
  240. 	F0R(i,Q) {
  241. 		int x,y,v; re(x,y,v);
  242. 		vi a = vals(x,v), b = vals(y,v);
  243. 		int ans = 1e9;
  244. 		int ia = 0, ib = 0;
  245. 		while (ia < sz(a) && ib < sz(b)) {
  246. 			ckmin(ans,abs(a[ia]-b[ib]));
  247. 			if (a[ia] < b[ib]) ia ++;
  248. 			else ib ++;
  249. 		}
  250. 		ps(ans);
  251. 	}
  252. 	// you should actually read the stuff at the bottom
  253. }
  254.  
  255. /* stuff you should look for
  256. 	* int overflow, array bounds
  257. 	* special cases (n=1?)
  258. 	* do smth instead of nothing and stay organized
  259. 	* WRITE STUFF DOWN
  260. 	* DON'T GET STUCK ON ONE APPROACH
  261. */
Success #stdin #stdout 0.01s 41276KB
comments (?)
stdin
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6 5 11 4
2 42 1000 54 68 234
0 1
2 0
3 4
3 5
3 5
1 3
5 3
0 5
3 0
1 3
3 5
0 3 4
3 0 8
0 5 5
3 0 11
stdout
copy 
26
0
1000000000
14
https://ideone.com/jXqryR
CEOI 2020 - Potion
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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