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#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef int64_t   ll;
typedef pair<int,int> ii;
typedef pair<ll, ll> ill;
 
#define EL printf("\n")
#define OK printf("OK")
#define pb push_back
#define mp make_pair
#define X  first
#define Y  second
#define fillchar(a,x) memset(a, x, sizeof(a))
#define FOR(i,l,r) for (int i=l;i<=r;i++)
#define FORD(i,r,l) for (int i=r;i>=l;i--)
 
typedef pair<ii,int> dat;
const int N = 1010;
dat an[N];
int n,x0,y0,xi,yi;
 
bool cmp(dat u, dat v) {
    return (u.X.X < v.X.X or (u.X.X == v.X.X and u.X.Y < v.X.Y)
            or (u.X == v.X and u.Y < v.Y));
}
 
int main()
{
    //freopen("INP.INP","r",stdin);
    //freopen("OUT.OUT","w",stdout);
 
    scanf("%d%d%d\n", &n,&x0,&y0);
    FOR(i,1,n) {
        scanf("%d%d", &xi,&yi);
        int a = y0-yi;
        int b = xi-x0;
        int c = -y0*(x0-xi) + x0*(y0-yi);
        int g = __gcd(__gcd(a,b),c);
        a /= g;
        b /= g;
        c /= g;
        if (a < 0) {
            a = -a;
            b = -b;
            c = -c;
        }
        an[i] = mp(mp(a,b),c);
    }
    sort(an+1,an+n+1,cmp);
    int res = unique(an+1,an+n+1)-an-1;
    printf("%d\n", res);
 
    return 0;
}
 

prog.cpp:23:10: error: 'int y0' redeclared as different kind of symbol
 int n,x0,y0,xi,yi;
          ^
In file included from /usr/include/features.h:374:0,
                 from /usr/include/assert.h:35,
                 from /usr/include/c++/4.9/cassert:43,
                 from /usr/include/i386-linux-gnu/c++/4.9/bits/stdc++.h:33,
                 from prog.cpp:1:
/usr/include/i386-linux-gnu/bits/mathcalls.h:240:1: note: previous declaration 'double y0(double)'
 __MATHCALL (y0,, (_Mdouble_));
 ^
prog.cpp: In function 'int main()':
prog.cpp:38:20: warning: pointer to a function used in arithmetic [-Wpointer-arith]
         int a = y0-yi;
                    ^
prog.cpp:38:19: error: invalid conversion from 'double (*)(double) throw ()' to 'int' [-fpermissive]
         int a = y0-yi;
                   ^
prog.cpp:40:18: error: wrong type argument to unary minus
         int c = -y0*(x0-xi) + x0*(y0-yi);
                  ^
prog.cpp:40:38: warning: pointer to a function used in arithmetic [-Wpointer-arith]
         int c = -y0*(x0-xi) + x0*(y0-yi);
                                      ^
prog.cpp:40:40: error: invalid operands of types 'int' and 'double (*)(double) throw ()' to binary 'operator*'
         int c = -y0*(x0-xi) + x0*(y0-yi);
                                        ^

Standard output is empty