제출 #6089

#제출 시각아이디문제언어결과실행 시간메모리
6089baneling100포탈들 (BOI14_portals)C++98
20 / 100
4 ms24736 KiB
#include <stdio.h> #include <queue> #define INF 0x7fffffff using namespace std; queue <int> q; int R, C, Sy, Sx, Cy, Cx, A[1002][1002], D[1001][1001], Dy[4]={0,1,0,-1}, Dx[4]={1,0,-1,0}; int Up[1001][1001], Down[1001][1001], Left[1001][1001], Right[1001][1001]; void input(void) { int i, j, x; char temp[1002]; scanf("%d %d",&R,&C); for(i=1 ; i<=R ; i++) { scanf("%s",&temp[1]); for(j=1 ; j<=C ; j++) { if(temp[j]=='S') { Sy=i; Sx=j; } else if(temp[j]=='C') { Cy=i; Cx=j; } else if(temp[j]=='#') A[i][j]=1; D[i][j]=INF; } } for(i=0 ; i<=R+1 ; i++) for(j=0 ; j<=C+1 ; j++) if(i==0 || i==R+1 || j==0 || j==C+1) A[i][j]=1; for(i=0 ; i<=R+1 ; i++) { for(j=0 ; j<=C+1 ; j++) { if(A[i][j]) x=j; else Left[i][j]=x+1; } for(j=C+1 ; j>=0 ; j--) { if(A[i][j]) x=j; else Right[i][j]=x-1; } } for(i=0 ; i<=C+1 ; i++) { for(j=0 ; j<=R+1 ; j++) { if(A[j][i]) x=j; else Up[j][i]=x+1; } for(j=R+1 ; j>=0 ; j--) { if(A[j][i]) x=j; else Down[j][i]=x-1; } } } void process(void) { int i, y, x, ty, tx, ok; D[Sy][Sx]=0; q.push(Sy); q.push(Sx); while(!q.empty()) { y=q.front(); q.pop(); x=q.front(); q.pop(); ok=0; for(i=0 ; i<4 ; i++) { ty=y+Dy[i]; tx=x+Dx[i]; if(A[ty][tx]) ok=1; else if(D[ty][tx]>D[y][x]+1) { D[ty][tx]=D[y][x]+1; q.push(ty); q.push(tx); } } if(ok) { if(D[Up[y][x]][x]>D[y][x]+1) { D[Up[y][x]][x]=D[y][x]+1; q.push(Up[y][x]); q.push(x); } if(D[Down[y][x]][x]>D[y][x]+1) { D[Down[y][x]][x]=D[y][x]+1; q.push(Down[y][x]); q.push(x); } if(D[y][Left[y][x]]>D[y][x]+1) { D[y][Left[y][x]]=D[y][x]+1; q.push(y); q.push(Left[y][x]); } if(D[y][Right[y][x]]>D[y][x]+1) { D[y][Right[y][x]]=D[y][x]+1; q.push(y); q.push(Right[y][x]); } } } } void output(void) { printf("%d",D[Cy][Cx]); } int main(void) { input(); process(); output(); return 0; }
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