TYVJ 1074 武士风度的牛 解题报告

  真的好悲催,不知道是手生了还是蠢了,查了好久发现问题出在宏上面把变量名写错了。

  这题比较简单吧,就是一个模拟,或者说BFS,广搜。。代码:

#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#define MAX 50000
char map[150][151];
struct {
	int x, y;
}queue[MAX];
int start, end;
int cost[150][150];
int used[150][150];

void enqueue(int a, int b)
{
	int t = (end + 1) % MAX;
	if(used[a][b]){
		return;
	}
	used[a][b] = 1;
	assert(t != start);
	queue[end].x = a;
	queue[end].y = b;
	end = t;
}

void exqueue(int *a, int *b)
{
	assert(start != end);
	*a = queue[start].x;
	*b = queue[start].y;
	used[*a][*b] = 0;
	start = (start + 1) % MAX;
}

int main(int argc, char **argv)
{
	int i, j;
	int m, n;
	int x, y;
	int a, b;
	scanf("%d%d\n", &m, &n);
	for(i = 0; i < n; i++){
		for(j = 0; j < m; j++){
			cost[i][j] = 0xFFFFFFF;
		}
	}
	for(i = 0; i < n; i++){
		scanf("%s\n", map[i]);
		enqueue(map[i][0], map[i][1]);
		for(j = 0; j < m; j++){
			if(map[i][j] == 'K'){
				cost[i][j] = 0;
				map[i][j] = '.';
				enqueue(i, j);
			}
			if(map[i][j] == 'H'){
				map[i][j] = '.';
				a = i, b = j;
			}
		}
	}
	while(start != end){
		exqueue(&x, &y);
#define can(i, k) ((i) >= 0 && (i) < (k))
#define deal(a, b) if(can(a, n) && can(b, m) && map[(a)][(b)] == '.' && cost[a][b] > cost[x][y] + 1){\
	cost[a][b] = cost[x][y] + 1;\
	enqueue((a), (b));\
}
		deal(x + 2, y - 1);
		deal(x + 2, y + 1);
		deal(x - 2, y - 1);
		deal(x - 2, y + 1);
		deal(x + 1, y - 2);
		deal(x + 1, y + 2);
		deal(x - 1, y - 2);
		deal(x - 1, y + 2);
	}
	printf("%d\n", cost[a][b]);
	return 0;
}

posted @ 2011-07-06 17:10  zqynux  阅读(264)  评论(0编辑  收藏  举报