1 solutions
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0
用两个队列 一个用来正常前进,一个用来看传送过去有没有用
#include<bits/stdc++.h> using namespace std; char ma[250][250]; bool v[250][250]; int dx[]={1,-1,0,0},dy[]={0,0,1,-1}; int n,m,sx,sy,ex,ey,ans=-1,temp=1e5; struct point { int x,y,t; }; queue<point> q; queue<point> a;//传送后的; void find(int x,int y,int t) { bool A[250][250]={0}; a.push((point){ex,ey,0}); A[ex][ey]=1; A[x][y]=1; while(!a.empty()) { point w=a.front(); a.pop(); if(ma[w.x][w.y]=='@') { temp=w.t+t; return; } for(int i=0;i<4;i++) { int xx=w.x+dx[i]; int yy=w.y+dy[i]; if(xx>=0&&yy>=0&&yy<m&&xx<n&&ma[xx][yy]!='#'&&!A[xx][yy]) { A[xx][yy]=1; a.push((point){xx,yy,w.t+1}); } } } } void bfs(int x,int y) { int tp=1; q.push((point){x,y,0}); v[x][y]=1; while(!q.empty()) { point now=q.front(); q.pop(); if(ma[now.x][now.y]=='P') { // cout<<now.t<<" "<<temp<<endl; ans=min(now.t,temp); return; } if(ma[now.x][now.y]=='@'&&tp) { find(now.x,now.y,now.t); tp=0; } for(int i=0;i<4;i++) { int xx=now.x+dx[i]; int yy=now.y+dy[i]; if(xx>=0&&yy>=0&&yy<m&&xx<n&&ma[xx][yy]!='#'&&!v[xx][yy]) { v[xx][yy]=1; q.push((point){xx,yy,now.t+1}); } } } } int main() { cin>>n>>m; for(int i=0;i<n;i++) { cin>>ma[i]; for(int j=0;j<m;j++) { if(ma[i][j]=='S') sx=i,sy=j; else if(ma[i][j]=='P') ex=i,ey=j; } } bfs(sx,sy); cout<<ans; return 0; }
Information
- ID
- 6539
- Time
- 1000ms
- Memory
- 256MiB
- Difficulty
- 3
- Tags
- # Submissions
- 52
- Accepted
- 10
- Uploaded By