Submission #950677

#	Time	Username	Problem	Language	Result	Execution time	Memory
950677		kilkuwu	Game (IOI14_game)	C++17	42 / 100	1055 ms	7040 KiB

game

#ifdef LOCAL
#ifndef _GAME_H
#define _GAME_H

void initialize(int n);
int hasEdge(int u, int v);

#include <cstdio>
#include <cassert>
#include "game.h"

int read_int() {
    int x;
    assert(scanf("%d", &x) == 1);
    return x;
}

int main() {
    int n, u, v;
    n = read_int();
    initialize(n);
    for (int i = 0; i < n * (n - 1) / 2; i++) {
        u = read_int();
        v = read_int();
        printf("%d\n", hasEdge(u, v));
    }
    return 0;
}

#endif
#else 
#include "game.h"
#endif

#include <bits/stdc++.h>

struct DSU {
  std::vector<int> e;
  int cnt = 0;

  DSU(int n) : e(n, -1) {}

  int find(int u) {
    return e[u] < 0 ? u : e[u] = find(e[u]);
  }
  
  bool merge(int u, int v) {
    u = find(u), v = find(v);
    if (u == v) return false;
    cnt++;
    if (e[u] > e[v]) std::swap(u, v);
    e[u] += e[v];
    e[v] = u;
    return true;
  } 

  bool same(int u, int v) {
    return find(u) == find(v);
  }
  
  int size(int u) {
    return -e[find(u)];
  }

  int size() {
    return e.size() - cnt;
  }
};

const int mxN = 1500;
int broken[mxN][mxN];
int n;


void initialize(int _n) {
  n = _n;
}

int hasEdge(int u, int v) {
  // let's delete this
  broken[u][v] = 1;
  broken[v][u] = 1;

  DSU dsu(n);
  for (int i = 0; i < n; i++) {
    for (int j = i + 1; j < n; j++) {
      if (!broken[i][j]) {
        dsu.merge(i, j);
      }
    }
  }

  if (dsu.size() == 1) {
    return 0;
  } else {
    broken[u][v] = broken[v][u] = 0;
    return 1;
  }
}

• Subtask 1: 15 / 15
• Subtask 2: 27 / 27
• Subtask 3: 0 / 58