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XDOJ_1089_bfs+优先队列
http://acm.xidian.edu.cn/problem.php?id=1089
按时间bfs+优先队列,注意水珠一起到达一点炸开的情况。
#include<iostream> #include<cstring> #include<cstdio> #include<algorithm> #include<queue> using namespace std; int n,m,nn,tt,a[105][2],sta[105][105],t[105][105],dir[4][2] = {-1,0,0,-1,1,0,0,1}; struct water { int x,y,d,t; water(int _x,int _y,int _d,int _t):x(_x),y(_y),d(_d),t(_t){}; friend bool operator <(water X,water Y) { return X.t > Y.t; } }; void bfs(int x,int y) { priority_queue<water> q; q.push(water(x,y,0,1)); q.push(water(x,y,1,1)); q.push(water(x,y,2,1)); q.push(water(x,y,3,1)); while(!q.empty()) { water temp = q.top(); q.pop(); if(temp.t > tt) return; int xx = temp.x+dir[temp.d][0],yy = temp.y+dir[temp.d][1]; if(xx < 1 || xx > n || yy < 1 || yy > m) continue; if(t[xx][yy] == temp.t) continue; if(sta[xx][yy] == 0) q.push(water(xx,yy,temp.d,temp.t+1)); else if(sta[xx][yy] == 4) { sta[xx][yy] = 0; t[xx][yy] = temp.t; q.push(water(xx,yy,0,temp.t+1)); q.push(water(xx,yy,1,temp.t+1)); q.push(water(xx,yy,2,temp.t+1)); q.push(water(xx,yy,3,temp.t+1)); } else sta[xx][yy]++; } } int main() { while(~scanf("%d%d%d%d",&n,&m,&nn,&tt)) { memset(sta,0,sizeof(sta)); memset(t,0,sizeof(t)); for(int i = 1;i <= nn;i++) { int x; scanf("%d%d%d",&a[i][0],&a[i][1],&x); sta[a[i][0]][a[i][1]] = x; } int x,y; scanf("%d%d",&x,&y); bfs(x,y); for(int i = 1;i <= nn;i++) { if(t[a[i][0]][a[i][1]] == 0) printf("1 %d\n",sta[a[i][0]][a[i][1]]); else printf("0 %d\n",t[a[i][0]][a[i][1]]); } } return 0; }
XDOJ_1089_bfs+优先队列
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