Submission #1016686

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016686		n3rm1n	Game (IOI14_game)	C++17	42 / 100	1073 ms	7340 KiB

game

#include <bits/stdc++.h>
#include "game.h"
using namespace std;
const int MAXN = 2e3 + 10;
int vcnt;
int used[MAXN][MAXN];
vector < int > g[MAXN];
void initialize(int n)
{
    vcnt = n;
}
int visited[MAXN], viscnt = 0;
void dfs(int beg)
{
   // cout << "* " << beg << endl;
    visited[beg] = 1;
    viscnt ++;
    int nb;
    for (int i = 0; i < g[beg].size(); ++ i)
    {
        nb = g[beg][i];
        if(!visited[nb])dfs(nb);
    }
}

void print_edges()
{
    for (int i = 0; i < vcnt; ++ i)
    {
        cout << "for " << i << endl;
        for  (int j = 0; j < g[i].size(); ++ j)
            cout << g[i][j] << " ";
        cout << endl;
    }
}
int hasEdge(int u, int v)
{

    //cout << vcnt << endl;
    viscnt = 0;
    memset(visited, 0, sizeof(visited));
    g[u].push_back(v);
    g[v].push_back(u);

  //  print_edges();
   // cout << " -- " << endl;
   // cout << "starting a dfs" << endl;
    dfs(0);
   // cout << " -- " << endl;
   // cout << "after connecting = "<< viscnt << endl;
    if(viscnt == vcnt) /// svyrzva
    {
        g[u].pop_back();
        g[v].pop_back();
        used[u][v] = 2;
        used[v][u] = 2;
      /// print_edges();
        return 0;
    }
    g[u].pop_back();
    g[v].pop_back();
    for (int i = 0; i < vcnt; ++ i)
    {
        for (int j = i+1; j < vcnt; ++ j)
        {
            if(!used[i][j] && !(i == min(u, v) && j == (max(u, v))))
            {
                g[i].push_back(j);
                g[j].push_back(i);
            }
        }
    }
    viscnt = 0;
    memset(visited, 0, sizeof(visited));
    //print_edges();
    dfs(0);
    for (int i = 0; i < vcnt; ++ i)
        {
            vector < int > neww;
            while(g[i].size())
            {
                int nb = g[i].back();
                if(used[i][nb] == 1)break;
                g[i].pop_back();
            }
        }
    if(viscnt != vcnt)
    {

        used[u][v] = 1;
        used[v][u] = 1;
        g[u].push_back(v);
    g[v].push_back(u);
  //  print_edges();
        return 1;
    }
   // g[u].push_back(v);
   // g[v].push_back(u);
    used[u][v] = 2;
    used[v][u] = 2;
    //print_edges();
    return 0;
}

Compilation message (stderr)

game.cpp: In function 'void dfs(int)':
game.cpp:19:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int i = 0; i < g[beg].size(); ++ i)
      |                     ~~^~~~~~~~~~~~~~~
game.cpp: In function 'void print_edges()':
game.cpp:31:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         for  (int j = 0; j < g[i].size(); ++ j)
      |                          ~~^~~~~~~~~~~~~

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