#include <bits/stdc++.h>
using namespace std;
class DSU {
int *par, *val;
int n;
public:
DSU(int n) {
this->n = n;
par = new int[n];
val = new int[n];
iota(par, par + n, 0);
fill(val, val + n, n - 1);
}
int find(int v) {
if (v == par[v])
return v;
else
return par[v] = find(par[v]);
}
int merge(int a, int b) {
int pa = find(a), pb = find(b);
if (pa == pb)
return 0;
par[pa] = pb;
val[pb] += val[pa] - 2;
return 1;
}
int get(int v) {
return val[find(v)];
}
int update(int u, int v) {
val[find(u)]--;
val[find(v)]--;
return 0;
}
};
DSU *dsu;
void initialize(int n) {
dsu = new DSU(n);
}
int hasEdge(int u, int v) {
int pu = dsu->find(u), pv = dsu->find(v);
assert(pu != pv);
if (dsu->get(pu) != 1 && dsu->get(pv) != 1)
return dsu->update(pu, pv);
else
return dsu->merge(pu, pv);
}
/*signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int n;
cin >> n;
initialize(n);
for (int i = 0; i < n * (n - 1) / 2; i++) {
int u, v;
cin >> u >> v;
cout << hasEdge(u, v) << endl;
}
}*/
