Submission #1016716

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016716		n3rm1n	Game (IOI14_game)	C++17	15 / 100	1 ms	856 KiB

game

#include <bits/stdc++.h>
#include "game.h"
using namespace std;
const int MAXN = 2e3 + 10;
int vcnt;
vector < int > g[MAXN];
unordered_set < int> s[MAXN];

void initialize(int n)
{
    vcnt = n;
    for (int i = 0; i < n; ++ i)
    {
        for (int j = 0; j < n; ++ j)
            if(i != j)s[i].insert(j);
    }
}
int visited[MAXN], viscnt = 0;
void dfs(int beg)
{
    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 dfs0(int beg)
{
    //cout << beg << endl;
    visited[beg] = 1;
    viscnt ++;
    int nb;
    for (unordered_set<int>::iterator it = s[beg].begin(); it != s[beg].end(); it ++)
    {
        nb = *it;
        if(!visited[nb])dfs0(nb);
    }
}
int f = 0;
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)
{


    viscnt = 0;
    memset(visited, 0, sizeof(visited));
    g[u].push_back(v);
    g[v].push_back(u);
    dfs(0);
    g[u].pop_back();
    g[v].pop_back();
    s[u].erase(v);
    s[v].erase(u);
    if(viscnt == vcnt)
    {
        return 0;
    }
    
     if(f)
    {
        f = 1;
        s[u].insert(v);
        s[v].insert(u);
        g[u].push_back(v);
        g[v].push_back(u);

        return 1;
    }
    viscnt = 0;
    memset(visited, 0, sizeof(visited));
    dfs0(0);
   //cout << viscnt << endl;

    if(viscnt != vcnt)
    {
        f = 1;
        s[u].insert(v);
        s[v].insert(u);
        g[u].push_back(v);
        g[v].push_back(u);

        return 1;
    }

    return 0;
}

Compilation message (stderr)

game.cpp: In function 'void dfs(int)':
game.cpp:24:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for (int i = 0; i < g[beg].size(); ++ i)
      |                     ~~^~~~~~~~~~~~~~~
game.cpp: In function 'void print_edges()':
game.cpp:49:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         for  (int j = 0; j < g[i].size(); ++ j)
      |                          ~~^~~~~~~~~~~~~

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