code.cpp

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

int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n, m;
        cin >> n >> m;

        int a[n + 1][m + 1];
        for (int i = 1; i <= n; i++)
        {
            for (int j = 1; j <= m; j++)
                cin >> a[i][j];
        }

        int dp[n + 1][m + 1] = {};
        int result = 0;
        for (int i = 1; i <= n; i++)
        {
            for (int j = 1; j <= m; j++)
            {
                if (a[i][j] != 0)
                {
                    dp[i][j] = min({dp[i - 1][j - 1], dp[i - 1][j], dp[i][j - 1]}) + 1;
                    result = max(result, dp[i][j]);
                }
            }
        }

        cout << dp[n][m] << endl;
    }
    system("pause");
    return 0;
}