95分求调，回复必关

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

int a[11][11];

bool check(int x1, int y1, int x2, int y2)
{
    int cnt1 = 0, cnt2 = 0;
    for (int i = x1; i <= x2; i++)
    {
        for (int j = y1; j <= y2; j++)
        {
            if (a[i][j] == 1)
            {
                cnt1++;
            }
            else
            {
                cnt2++;
            }
        }
    }
    if (cnt1 == cnt2)
    {
        return true;
    }
    else
    {
        return false;
    }
}
int main()
{
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        string s;
        cin >> s;
        for (int j = 0; j < m; j++)
        {
            a[i][j + 1] = s[j] - '0';
        }
    }
    int ans = 0;
    for (int x1 = 1; x1 <= n; x1++)
    {
        for (int y1 = 1; y1 <= m; y1++)
        {
            for (int x2 = 1; x2 <= n; x2++)
            {
                for (int y2 = 1; y2 <= m; y2++)
                {
                    if (x1 == x2 && y1 == y2)
                    {
                        continue;
                    }
                    if (check(x1, y1, x2, y2))
                    {
                        ans = max(ans, (x2 - x1 + 1) * (y2 - y1 + 1));
                    }
                }
            }
        }
    }
    cout << ans;
    return 0;
}