http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=4842
要注意题目中两点:
1.在踏入妖怪控制的区域那一刹那,先减行动力,然后才能杀妖怪
2.在妖怪控制区域行动力也会恢复
3.妖怪也许不在自己的控制区域
#include <cstdio> #include <cstring> #include <algorithm> #include <queue> using namespace std; const int maxn=100; const int dx[4] = {0,0,-1,1}; const int dy[4] = {1,-1,0,0}; int n,m,l,k,sx,sy,tx,ty; int maz[maxn][maxn]; int mon[6][2]; int vis[maxn][maxn][maxn]; int ind[maxn][maxn]; struct P{ int x,y,sta,r; P(){x = y = sta = r = 0;} P(int _x,int _y,int _sta,int _r){ x = _x; y = _y; sta = _sta; r = _r; } bool operator <(P p2)const { if(vis[x][y][sta] != vis[p2.x][p2.y][p2.sta]) return vis[x][y][sta] > vis[p2.x][p2.y][p2.sta]; return r < p2.r; } }; int ok(int x,int y,int sta){ if(x < 1 || y < 1 || x > n || y > m)return -1; int ki = maz[x][y]; if(ki == -1)return -1; if(ki > 0){ if(sta & (1 << (ki-1)))return 1; return 0; } return 1; } priority_queue <P> que; int bfs(){ memset(vis ,-1, sizeof vis); vis[sx][sy][0] = 0; que.push(P(sx,sy,0,0)); while(!que.empty()){ P tp=que.top();que.pop(); // printf("pop x: %d y: %d sta: %d step %d turn %d\n",tp.x,tp.y,tp.sta,tp.r,vis[tp.x][tp.y][tp.sta]); if(tx == tp.x && ty == tp.y)return vis[tx][ty][tp.sta]; for(int i = 0;i < 4;i++){ int tmpx = tp.x + dx[i]; int tmpy = tp.y + dy[i]; int sta = tp.sta; if(ind[tmpx][tmpy] != 0)sta |= (1 << (ind[tmpx][tmpy] - 1)); if(ok(tmpx,tmpy,tp.sta) >= 0 && vis[tmpx][tmpy][sta] == -1){ if(tp.r == 0){ vis[tmpx][tmpy][sta] = vis[tp.x][tp.y][tp.sta] + 1; // printf("push x: %d y: %d sta: %d step %d turn %d\n", // tmpx,tmpy,sta,(ok(tmpx,tmpy,sta)==0?0:l-1),vis[tp.x][tp.y][tp.sta]+1); que.push(P(tmpx,tmpy,sta,(ok(tmpx,tmpy,tp.sta) == 0?0:l-1))); } else { vis[tmpx][tmpy][sta] = vis[tp.x][tp.y][tp.sta]; //printf("push x: %d y: %d sta: %d step %d turn %d\n", // tmpx,tmpy,sta,(ok(tmpx,tmpy,sta)==0?0:tp.r-1),vis[tp.x][tp.y][tp.sta]); que.push(P(tmpx,tmpy,sta,(ok(tmpx,tmpy,tp.sta) == 0?0:tp.r-1))); } } } } return -1; } int main(){ while(scanf("%d%d%d",&n,&m,&l) == 3){ while(!que.empty())que.pop(); memset(ind,0,sizeof ind); for(int i = 1;i <= n;i++){ for(int j = 1;j <= m;j++){ scanf("%d",maz[i]+j); } } scanf("%d",&k); for(int i = 1;i <= k;i++){ scanf("%d%d",mon[i],mon[i] + 1); ind[mon[i][0]][mon[i][1]]=i; } scanf("%d%d%d%d",&sx,&sy,&tx,&ty); int ans = bfs(); if(ans < 0){ puts("We need God‘s help!"); } else { printf("%d\n",ans); } } return 0; }
时间: 2024-11-05 03:33:46