第十届蓝桥杯--迷宫_第十届蓝桥杯迷宫

第十届蓝桥杯 ——迷宫_六级不考550+不改名-CSDN博客https://blog.csdn.net/weixin_46239370/article/details/105763944代码：

#include <iostream>
#include <cstring>
#include <queue>
using namespace std;
 
typedef pair<int, int> PII;
 
char g[30][50];
int dist[30][50];
 
char dir[] = {'D', 'L', 'R', 'U'};
int dx[] = {1, 0, 0, -1}, dy[] = {0, -1, 1, 0};
 
void bfs()
{
	memset(dist, -1, sizeof dist);
	queue<PII> q;
	q.push({29, 49});
	dist[29][49] = 0;
	
	while(q.size())
	{
		PII t = q.front();
		q.pop();
		
		for (int i = 0; i < 4; i ++)
		{
			int a = t.first + dx[i], b = t.second + dy[i];
			if(a < 0 || a >= 30 || b < 0 || b >= 50) continue;
			if(g[a][b] == '1' || dist[a][b] != -1) continue;
			q.push({a, b});
			dist[a][b] = dist[t.first][t.second] + 1;
		}
	}
}
 
int main()
{
	for (int i = 0; i < 30; i ++) cin >> g[i];
	
	bfs();
	
	string ans;
	int x = 0, y = 0;
	while(x != 29 || y != 49)
	{
		for (int i = 0; i < 4; i ++)
		{
			int a = x + dx[i], b = y + dy[i];
			if(a < 0 || a >= 30 || b < 0 || b >= 50) continue;
			if(g[a][b] == '1') continue;
			if(dist[x][y] == dist[a][b] + 1)
			{
				ans += dir[i];
				x = a, y = b;
				break;
			}
		}
	}
 
	cout << ans << endl;
	return 0;
}