572 - Oil Deposits

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#include <iostream>
using namespace std;
int m, n, deposit;
char grid[100][100];
void DFS(int x, int y) {
    int xi, yj;
    grid[x][y] = '*';
    for (int i = -1; i <= 1; ++i) {
        for (int j = -1; j <= 1; ++j) {
            xi = x + i;
            yj = y + j;
            if (0 <= xi && xi < m &&
                0 <= yj && yj < n &&
                grid[xi][yj] == '@') {
                DFS(xi, yj);
            }
        }
    }
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    while (cin >> m >> n && m != 0) {
        for (int i = 0; i < m; ++i) {
            for (int j = 0; j < n; ++j) {
                cin >> grid[i][j];
            }
        }
        deposit = 0;
        for (int i = 0; i < m; ++i) {
            for (int j = 0; j < n; ++j) {
                if (grid[i][j] == '@') {
                    ++deposit;
                    DFS(i, j);
                }
            }
        }
    }
    cout << deposit << '\n';
    return 0;
}