/*input
*/
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#include "game.h"
using namespace std;
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<vl> vll;
typedef vector<pi> vpi;
typedef vector<vpi> vpii;
typedef vector<pl> vpl;
typedef vector<cd> vcd;
typedef vector<pd> vpd;
typedef vector<bool> vb;
typedef vector<vb> vbb;
typedef std::string str;
typedef std::vector<str> vs;
#define x first
#define y second
#define debug(...) cout<<"["<<#__VA_ARGS__<<": "<<__VA_ARGS__<<"]\n"
const int MOD = 1000000007;
const ll INF = std::numeric_limits<ll>::max();
const ld PI = 3.14159265358979323846264338327950288419716939937510582097494L;
template<typename T>
pair<T, T> operator+(const pair<T, T> &a, const pair<T, T> &b) { return pair<T, T>(a.x + b.x, a.y + b.y); }
template<typename T>
pair<T, T> operator-(const pair<T, T> &a, const pair<T, T> &b) { return pair<T, T>(a.x - b.x, a.y - b.y); }
template<typename T>
T operator*(const pair<T, T> &a, const pair<T, T> &b) { return (a.x * b.x + a.y * b.y); }
template<typename T>
T operator^(const pair<T, T> &a, const pair<T, T> &b) { return (a.x * b.y - a.y * b.x); }
template<typename T>
void print(vector<T> vec, string name = "") {
cout << name;
for (auto u : vec)
cout << u << ' ';
cout << '\n';
}
const int MX = 1500;
vii liko(MX, vi(MX, 1));
vbb buvo(MX, vb(MX, false));
vi p;
int N;
void initialize(int n) {
N = n;
p = vi(n + 1); for (int i = 0; i <= n; i++) p[i] = i;
}
void unionSet(int a, int b) {
int prad = p[a];
for (int i = 0; i < N; ++i)
if (p[i] == prad)
p[i] = p[b];
}
void merge(int a, int b) {
unionSet(a, b);
int tev = p[a];
vi curr;
vi kiti;
for (int i = 0; i < N; ++i)
{
if (p[i] != tev) kiti.emplace_back(i);
else curr.emplace_back(i);
liko[tev][i] = 0;
liko[i][tev] = 0;
}
for (auto pir : curr) {
for (auto ant : kiti) {
liko[tev][p[ant]] += !buvo[pir][ant];
liko[p[ant]][tev] += !buvo[pir][ant];
}
}
}
int hasEdge(int u, int v) {
buvo[u][v] = buvo[v][u] = true;
u = p[u];
v = p[v];
if (u == v) return 0;
if (liko[u][v] != 1) {
liko[u][v]--;
liko[v][u]--;
return 0;
}
merge(u, v);
return 1;
}
