杭电2579--Dating with girls(2)（Bfs）

最新推荐文章于 2018-07-22 16:25:21 发布

转载最新推荐文章于 2018-07-22 16:25:21 发布 · 79 阅读

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原文链接：http://www.cnblogs.com/soTired/p/4927444.html

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#java

本文介绍了一种在特殊迷宫中寻找目标位置的算法。迷宫中的石头会在特定时间消失，玩家需找到女孩的位置，否则她将被其他人找到。文章通过广度优先搜索实现了这一过程，并分享了使用三维数组来标记已访问位置的重要性。

Dating with girls(2)

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 2601 Accepted Submission(s): 723

Problem Description

If you have solved the problem Dating with girls(1).I think you can solve this problem too.This problem is also about dating with girls. Now you are in a maze and the girl you want to date with is also in the maze.If you can find the girl, then you can date with the girl.Else the girl will date with other boys. What a pity!
The Maze is very strange. There are many stones in the maze. The stone will disappear at time t if t is a multiple of k(2<= k <= 10), on the other time , stones will be still there.
There are only ‘.’ or ‘#’, ’Y’, ’G’ on the map of the maze. ’.’ indicates the blank which you can move on, ‘#’ indicates stones. ’Y’ indicates the your location. ‘G’ indicates the girl's location . There is only one ‘Y’ and one ‘G’. Every seconds you can move left, right, up or down.

Input

The first line contain an integer T. Then T cases followed. Each case begins with three integers r and c (1 <= r , c <= 100), and k(2 <=k <= 10).
The next r line is the map’s description.

Output

For each cases, if you can find the girl, output the least time in seconds, else output "Please give me another chance!".

Sample Input

6 6 2

...Y..

...#..

.#....

...#..

..#G#.

Sample Output

Source

HDU 2009-5 Programming Contest

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这题做的爽，关键是题目信息有意思。不太明白的是为什么非得用三维数组加一个状态才能过，用判断是不是石头和步数是否可以整除K, 再把路标记成石头不能过，也真是奇葩。

#include <queue> 
#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;
char map[101][101]; int vis[101][101][10], ac[4][2] = {0, 1, 0, -1, 1, 0, -1, 0};
struct Maze{
    int x, y, step;
} R, M, B;
int n, m, k;
int Bfs(int a, int b){
    memset(vis, 0, sizeof(vis));
    queue<Maze> Q;
    R.x = a; R.y = b; R.step = 0;
//    map[a][b] = '#';
    Q.push(R);
    while(!Q.empty()){
        R = Q.front(); Q.pop();
        for(int i = 0; i < 4; i++){
            M.x = R.x + ac[i][0];
            M.y = R.y + ac[i][1];
            M.step = R.step + 1;
            int d = M.step%k;
            if(M.x >= 0 && M.x < n && M.y >= 0 && M.y < m && !vis[M.x][M.y][d]){ //(map[M.x][M.y] != '#' ||(map[M.x][M.y] == '#' && M.step%k == 0))){
                if(map[M.x][M.y] == 'G')
                    return M.step;
                else{
                    vis[M.x][M.y][d] = 1; 
                    if(map[M.x][M.y] == '#' && d)
                        continue;
                    Q.push(M); 
                    
                } 
            }
        }
    }
    return 0;
}
int main(){
    int T;
    scanf("%d", &T);
    while(T--){
        scanf("%d%d%d", &n, &m, &k);
        int x, y;
        for(int i = 0; i < n; i++){
            scanf("%s", map[i]);
            for(int j = 0; j < m; j++)
                if(map[i][j] == 'Y'){
                    x = i; y = j;    
                }
        }
        int ans = Bfs(x, y);
        if(ans)
            printf("%d\n", ans);        
        else
            printf("Please give me another chance!\n");
    }
    return 0;
}