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46 lines
963 B
46 lines
963 B
#include<bits/stdc++.h>
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using namespace std;
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// 一行一行的枚举，先枚举第一行，然后枚举每一列，在枚举的列的时候对行进行深搜。
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int n, cnt = 0, _map[10][10], vis[10][10];
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bool check(int x, int y, int color) {
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int i, j;
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for (i = 1; i <= x; i++)
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if (vis[i][y] == color) return false;
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for (i = x, j = y; i > 0 && j > 0; i--, j--)
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if (vis[i][j] == color) return false;
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for (i = x, j = y; i > 0 && j <= n; i--, j++)
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if (vis[i][j] == color) return false;
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return true;
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}
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void dfs(int i) {
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int j, k;
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if (i > n) {
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cnt++;
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return;
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}
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for (j = 1; j <= n; j++) {
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if (_map[i][j] == 1 && check(i, j, 1)) {
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vis[i][j] = 1;
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for (k = 1; k <= n; k++) {
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if (j != k && _map[i][k] == 1 && check(i, k, -1)) {
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vis[i][k] = -1;
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dfs(i + 1);
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vis[i][k] = 0;
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}
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}
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vis[i][j] = 0;
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}
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}
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}
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int main() {
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int i, j;
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cin >> n;
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for (i = 1; i <= n; i++)
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for (j = 1; j <= n; j++)
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cin >> _map[i][j];
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dfs(1);
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cout << cnt << endl;
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return 0;
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}
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