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378. 骑士放置
https://www.acwing.com/problem/content/submission/code_detail/16206815/
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AcWing/378/378.cpp
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64
AcWing/378/378.cpp
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#include <iostream>
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#include <cstring>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 105;
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const int dx[] = {2, 2, -2, -2, 1, 1, -1, -1},
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dy[] = {1, -1, 1, -1, 2, -2, 2, -2};
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int n, m, t, ans;
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std::pair<int, int> match[N][N];
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bool disabled[N][N], vis[N][N];
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bool dfs(int x, int y) {
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for (int i = 0; i < 8; i++) {
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int xx = x + dx[i],
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yy = y + dy[i];
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if (xx < 1 || xx > n || yy < 1 || yy > m) continue;
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if (disabled[xx][yy] || vis[xx][yy]) continue;
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vis[xx][yy] = true;
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auto t = match[xx][yy];
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if (!t.first || dfs(t.first, t.second)) {
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match[xx][yy] = std::make_pair(x, y);
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return true;
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}
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}
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return false;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m >> t;
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for (int i = 1; i <= t; i++) {
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int x, y;
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cin >> x >> y;
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disabled[x][y] = true;
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}
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= m; j++) {
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if (disabled[i][j] || (i + j) % 2) continue;
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memset(vis, 0x00, sizeof(vis));
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if (dfs(i, j)) ans++;
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}
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}
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cout << n * m - t - ans << endl;
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return 0;
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}
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AcWing/378/data/1.in
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