mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
#include <cstdlib>
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#include <cstring>
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#include <cstdio>
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#include <algorithm>
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#include <iostream>
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#include <queue>
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using namespace std;
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int N, T, sx, sy;
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char mp[105][105];
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char vis[105][105][2];
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struct Sta {
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int x, y, t;
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};
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queue<Sta>q;
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int dir[8][2]={{-1,0},{-1,1},{0,1},{1,1},{1,0},{1,-1},{0,-1},{-1,-1}};
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inline bool judge(int x, int y) {
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if (x >= 0 && x < N && y >= 0 && y < N) return true;
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return false;
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}
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void cover(const Sta &cur) {
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Sta nxt;
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bool flag = false;
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for (int k = 0; k < 8; ++k) {
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nxt.x = cur.x + dir[k][0];
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nxt.y = cur.y + dir[k][1];
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nxt.t = cur.t + 1;
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if (judge(nxt.x, nxt.y) && mp[nxt.x][nxt.y] == '.') {
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flag = true;
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if (!vis[nxt.x][nxt.y][nxt.t&1]) {
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vis[nxt.x][nxt.y][nxt.t&1] = 1;
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if (nxt.t < T) {
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q.push(nxt);
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}
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}
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}
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}
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if (!flag) {
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nxt = cur;
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++nxt.t;
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if (!vis[nxt.x][nxt.y][nxt.t&1]) {
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vis[nxt.x][nxt.y][nxt.t&1] = 1;
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if (nxt.t < T) {
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q.push(nxt);
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}
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}
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}
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}
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void solve() {
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while (!q.empty()) q.pop();
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memset(vis, 0, sizeof (vis));
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Sta cur, nxt;
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nxt.x = sx, nxt.y = sy, nxt.t = 0;
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vis[sx][sy][0] = 1;
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q.push(nxt);
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while (!q.empty()) {
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cur = q.front(), q.pop();
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cover(cur);
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}
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int odd = 0, even = 0;
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for (int i = 0; i < N; ++i) {
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for (int j = 0; j < N; ++j) {
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if (vis[i][j][0]) ++even;
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if (vis[i][j][1]) ++odd;
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}
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}
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if (T & 1) printf("%d\n", odd);
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else printf("%d\n", even);
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}
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int main() {
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int C;
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scanf("%d", &C);
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while (C--) {
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scanf("%d %d %d %d", &N, &T, &sx, &sy);
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sx--, sy--;
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for (int i = 0; i < N; ++i) {
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scanf("%s", mp[i]);
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}
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solve();
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}
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return 0;
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}
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