文件目录

#include <bits/stdc++.h>
using namespace std;
int a[105][105], n, m;
int dir[4][2] = {1, 0, -1, 0, 0, 1, 0, -1};
void bfstowhite(int x, int y)
{
    for (int i = 0; i < 4; i++)
    {
        int xx = x + dir[i][0];
        int yy = y + dir[i][1];
        if (xx >= 0 && xx < n && yy >= 0 && yy < m)
            if (a[xx][yy] == 1)
            {
                a[xx][yy] = 0;
                bfstowhite(xx, yy);
            }
    }
}
int main()
{
    cin >> n >> m;
    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            cin >> a[i][j];
    int ans = 0;
    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            if (a[i][j] == 1)
            {
                ans++;
                a[i][j] = 0;
                bfstowhite(i, j);
            }
    cout << ans;
    return 0;
}