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Why I am getting WA. Please help...

#include<bits/stdc++.h>
#include<algorithm>
#include<cmath>
#include<cstdlib>
#include<cstdio>
using namespace std;
#define rep(i,n) for(__typeof(n) i=0;i<(n);i++)
#define REP(i,a,b) for(__typeof(b) i=(a);i<=(b);i++)
#define INF (1<<31)
#define pb push_back ...

Why I am getting WA . I cann't understand. Please help. :-? :-? :-? :-?
#include<bits/stdc++.h>
#define MAX 800
using namespace std;

typedef pair<double,pair<int,int> > edge;
vector<edge>e;
int par[MAX];
int f_set(int x)
{
if(par[x]==x)
return x;
return par[x]=f_set(par[x]);

}
bool u_set(int ...

Getting runtime error . Please Help.
struct edge
{
int a,b;
double cost;
bool operator <(const edge& p)const
{
return cost<p.cost;
}
};

vector<edge>e;
int par[760];
int x[760],y[760];


int f_parent(int u)
{
if(par[u]==u)
return u;
par[u]=f_parent(par[u]);
return par[u];
}
void mst(int n ...