Submission #16842

#TimeUsernameProblemLanguageResultExecution timeMemory
16842kdh9949Portals (BOI14_portals)C++98
70 / 100
1000 ms40568 KiB
#include <stdio.h> #include <queue> #include <algorithm> using namespace std; struct mindol{int x,y,t;bool operator<(const mindol &a)const{return t>a.t;}}; priority_queue<mindol> pq; char m[1010][1010]; int dt[4][1010][1010],dist[1010][1010]; int dx[4]={1,-1,0,0},dy[4]={0,0,1,-1}; int w,h,gx,gy,flag; int main(){ scanf("%d%d",&w,&h); for(int i=1;i<=w;i++){ scanf("%s",m[i]+1); } for(int i=0;i<=w+1;i++)for(int j=0;j<4;j++)m[i][0]=m[i][h+1]='#',dt[j][i][0]=dt[j][i][h+1]=-1; for(int i=0;i<=h+1;i++)for(int j=0;j<4;j++)m[0][i]=m[w+1][i]='#',dt[j][0][i]=dt[j][w+1][i]=-1; for(int i=1;i<=w;i++){ for(int j=1;j<=h;j++){ dist[i][j]=987654321; if(m[i][j]=='S')pq.push({i,j,0}); if(m[i][j]=='C')gx=i,gy=j; dt[0][w+1-i][j]=( m[w+1-i][j]=='#' ? -1 :dt[0][w+2-i][j]+1); dt[1][i][j]=(m[i][j]=='#' ? -1 : dt[1][i-1][j]+1); dt[2][i][h+1-j]=(m[i][h+1-j]=='#' ? -1 : dt[2][i][h+2-j]+1); dt[3][i][j]=(m[i][j]=='#' ? -1 : dt[3][i][j-1]+1); } } mindol cur; while(!pq.empty()){ cur=pq.top(); pq.pop(); if(m[cur.x][cur.y]=='#')continue; if(dist[cur.x][cur.y]<=cur.t)continue; dist[cur.x][cur.y]=cur.t; for(int i=0;i<4;i++){ pq.push({cur.x+dx[i],cur.y+dy[i],cur.t+1}); } for(int j=0;j<4;j++){ if(dt[j][cur.x][cur.y]<=1)continue; if(cur.t+min(min(j==0?987654321:dt[0][cur.x][cur.y],j==1?987654321:dt[1][cur.x][cur.y]), min(j==2?987654321:dt[2][cur.x][cur.y],j==3?987654321:dt[3][cur.x][cur.y]))+1>= dist[cur.x+dx[j]*dt[j][cur.x][cur.y]][cur.y+dy[j]*dt[j][cur.x][cur.y]])continue; pq.push({cur.x+dx[j]*dt[j][cur.x][cur.y],cur.y+dy[j]*dt[j][cur.x][cur.y],cur.t+min(min(j==0?987654321:dt[0][cur.x][cur.y], j==1?987654321:dt[1][cur.x][cur.y]), min(j==2?987654321:dt[2][cur.x][cur.y], j==3?987654321:dt[3][cur.x][cur.y]))+1}); } } printf("%d",dist[gx][gy]); }
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