#include<bits/stdc++.h>
using namespace std;
const int MAXN = 1510;
int N;
int rep[MAXN], tam[MAXN];
int conect[MAXN][MAXN];
int find(int a){
if(rep[a] == a) return a;
return rep[a] = find(rep[a]);
}
void uni(int a, int b){
a = find(a);
b = find(b);
if(tam[a] < tam[b]) swap(a, b);
rep[b] = a;
tam[a] += b;
for(int i = 0; i < N; i++)
conect[a][i] = conect[a][i] + conect[b][i], conect[i][a] = conect[a][i] + conect[b][i];
}
void initialize(int n) {
N = n;
for(int i = 0; i < N; i++){
rep[i] = i;
tam[i] = 1;
for(int j = 0; j < N; j++)
conect[i][j] = 1;
conect[i][i] = 0;
}
}
int hasEdge(int u, int v) {
u = find(u), v = find(v);
if(conect[u][v] == 1){
uni(u, v);
return 1;
}
conect[u][v]--;
conect[v][u]--;
return 0;
}
