This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#include <algorithm>
#include <math.h>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
ifstream in("input.txt");
ofstream out("output.txt");
typedef long long ll;
int N;
int k[1600];
int s[1600];
int p[1600][1600];
int find(int x){
while(x!=k[x])x=k[x];
return k[x];
}
bool same(int a, int b){
return find(a)==find(b);
}
void unite(int a, int b){
a=find(a);
b=find(b);
if(s[a]<s[b])swap(a,b);
k[b]=a;
s[a]+=s[b];
for(int i=0;i<N;i++)p[a][i]+=p[b][i];
}
void initialize(int n){
N=n;
for(int i=0;i<n;i++){
k[i]=i;
s[i]=1;
}
}
int hasEdge(int u, int v){
u=find(u);
v=find(v);
if(u==v)return 1;
if(p[u][v]/*+p[v][u]*/==s[u]*s[v]-1){
unite(u,v);
return 1;
}
p[u][v]++;
p[v][u]++;
return 0;
}
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