题意:中文题面
分析:双层BFS,之前写过类似的题.总结坑点:
1.步数小于等于T都是YES 2. 传送门的另一侧还是传送门或者墙都会死 3. 走到传送门也需要一步
#include <bits/stdc++.h> using namespace std; char maze[2][11][11]; int dx[4] = {-1, 1, 0, 0}; int dy[4] = {0, 0, -1, 1}; int n, m, tot; bool vis[2][11][11]; struct Point { int x, y, z, step; Point () {} Point (int x, int y, int z, int step) : x (x), y (y), z (z), step (step) {} }; Point s, e; bool check(int x, int y, int z) { if (x < 1 || x > n || y < 1 || y > m || vis[z][x][y] || maze[z][x][y] == '*') return false; else return true; } bool BFS(void) { memset (vis, false, sizeof (vis)); int res = 0x3f3f3f3f; queue<Point> que; que.push (s); vis[s.z][s.x][s.y] = true; while (!que.empty ()) { Point u = que.front (); que.pop (); if (u.x == e.x && u.y == e.y && u.z == e.z) { res = min (res, u.step); continue; } for (int i=0; i<4; ++i) { int tx = u.x + dx[i], ty = u.y + dy[i], tz = u.z; if (!check (tx, ty, tz)) continue; if (maze[tz][tx][ty] == '#') { if (maze[1-tz][tx][ty] == '*' || maze[1-tz][tx][ty] == '#' || vis[1-tz][tx][ty]) continue; vis[1-tz][tx][ty] = true; que.push (Point (tx, ty, 1 - tz, u.step + 1)); continue; } vis[tz][tx][ty] = true; que.push (Point (tx, ty, tz, u.step + 1)); } } return res <= tot; } int main(void) { int T; scanf ("%d", &T); while (T--) { scanf ("%d%d%d", &n, &m, &tot); for (int k=0; k<2; ++k) { if (k == 1) getchar (); for (int i=1; i<=n; ++i) { scanf ("%s", maze[k][i] + 1); for (int j=1; j<=m; ++j) { if (maze[k][i][j] == 'S') { s = Point (i, j, k, 0); } else if (maze[k][i][j] == 'P') { e = Point (i, j, k, 0); } } } } if (BFS ()) puts ("YES"); else puts ("NO"); } return 0; }