Submission #839973

#	Time	Username	Problem	Language	Result	Execution time	Memory
839973		grossly_overconfident	Soccer Stadium (IOI23_soccer)	C++17	1.50 / 100	543 ms	422832 KiB

soccer

#include <bits/stdc++.h>
#include "soccer.h"
using namespace std;

bool checkcell(int i, int j, int n, vector<vector<int>>& f){
    if (i < 0 || i >= n || j < 0 || j >= n || f[i][j] == 1){
        return false;
    }
    return true;
}

int dfs(int i, int j, int n, vector<vector<int>>& f){
    int t = 1;
    f[i][j] = 1;
    if (checkcell(i + 1, j, n, f)){
        t += dfs(i + 1, j, n, f);
    }
    if (checkcell(i - 1, j, n, f)){
        t += dfs(i - 1, j, n, f);
    }
    if (checkcell(i, j + 1, n, f)){
        t += dfs(i, j + 1, n, f);
    }
    if (checkcell(i, j - 1, n, f)){
        t += dfs(i, j - 1, n, f);
    }
    return t;
}

int biggest_stadium(int n, vector<vector<int>> f)
{
    int t = 0;
    int si, sj;
    for (int i = 0; i < n; ++i){
        for (int j = 0; j < n; ++j){
            t += 1 - f[i][j];
            if (f[i][j] == 0){
                si = i;
                sj = j;
            }
        }
    }
    vector<vector<int>> f2 = f;
    if (dfs(si, sj, n, f2) != t){
        return 1;
    }
    for (int i = 0; i < n; ++i){
        bool opened = false, closed = false;
        for (int j = 0; j < n; ++j){
            if (f[i][j] == 0){
                if (closed){
                    return 1;
                }
                opened = true;
            }
            if (f[i][j] == 1){
                if (opened){
                    closed = true;
                }
            }
        }
    }
    for (int i = 0; i < n; ++i){
        bool opened = false, closed = false;
        for (int j = 0; j < n; ++j){
            if (f[j][i] == 0){
                if (closed){
                    return 1;
                }
                opened = true;
            }
            if (f[j][i] == 1){
                if (opened){
                    closed = true;
                }
            }
        }
    }



    return t;
}

Compilation message (stderr)

soccer.cpp: In function 'int biggest_stadium(int, std::vector<std::vector<int> >)':
soccer.cpp:44:12: warning: 'si' may be used uninitialized in this function [-Wmaybe-uninitialized]
   44 |     if (dfs(si, sj, n, f2) != t){
      |         ~~~^~~~~~~~~~~~~~~
soccer.cpp:44:12: warning: 'sj' may be used uninitialized in this function [-Wmaybe-uninitialized]

• Subtask 0: 0 / 0
• Subtask 1: 1.5 / 6
• Subtask 2: 0 / 8
• Subtask 3: 0 / 22
• Subtask 4: 0 / 18
• Subtask 5: 0 / 16
• Subtask 6: 0 / 30