http://acm.hdu.edu.cn/showproblem.php?pid=1180
这题交了7次 悲剧了 前几次 因为把+行想成是左右走了 一直WA 后来看出来了 又把走过的楼梯给标记了 这里的楼梯不能标记
因为可以在原地等着楼梯转变 加的时间有可能是2 这样普通队列满足不了最少的先搜 就用优先队列了
View Code
1 #include<stdio.h> 2 #include<string.h> 3 typedef struct node 4 { 5 int x,y,num; 6 }st; 7 int f[22][22]; 8 char c[22][22]; 9 st q[10001],t; 10 int d,p; 11 void sort()//把用时少的优先放在队首 12 { 13 int i; 14 for(i = d ; i > p ; i--) 15 { 16 if(q[i].num<q[i-1].num) 17 { 18 t = q[i]; 19 q[i] = q[i-1]; 20 q[i-1] = t; 21 } 22 else 23 break; 24 } 25 } 26 void inque(int a,int b) 27 { 28 d++; 29 q[d].x = a; 30 q[d].y = b; 31 } 32 int main() 33 { 34 int n,m,i,j,x[2],y[2],dis[2] = {-1,1}; 35 while(scanf("%d%d%*c", &n,&m)!=EOF) 36 { 37 memset(f,0,sizeof(f)); 38 for(i = 1 ; i <= n ; i++) 39 { 40 for(j = 1 ; j <= m ; j++) 41 { 42 scanf("%c",&c[i][j]); 43 if(c[i][j] == 'S') 44 { 45 x[0] = i; 46 y[0] = j; 47 } 48 if(c[i][j] == 'T') 49 { 50 x[1] = i; 51 y[1] = j; 52 } 53 } 54 getchar(); 55 } 56 d = 0; 57 p = 0; 58 q[1].num = 0; 59 f[x[0]][y[0]] = 1; 60 inque(x[0],y[0]); 61 do 62 { 63 p++; 64 int px = q[p].x; 65 int py = q[p].y; 66 if(px==x[1]&&py==y[1]) 67 break; 68 int pf = q[p].num%2; 69 for(i = 0 ; i < 2 ; i++) 70 { 71 int qx = px+dis[i]; 72 int qy = py+dis[i]; 73 if(!f[qx][py]&&qx>0&&qx<=n&&(c[qx][py]=='.'||c[qx][py]=='|'||c[qx][py]=='-'||c[qx][py]=='T')) 74 { 75 if(c[qx][py]=='|'||c[qx][py]=='-') 76 { 77 if(!f[qx+dis[i]][py]&&qx+dis[i]>0&&qx+dis[i]<=n&&(c[qx+dis[i]][py]=='.'||c[qx+dis[i]][py]=='T')) 78 { 79 inque(qx+dis[i],py); 80 if((!pf&&c[qx][py]=='|')||(pf&&c[qx][py]=='-')) 81 { 82 q[d].num = q[p].num+1; 83 sort(); 84 } 85 else 86 { 87 q[d].num = q[p].num+2; 88 sort(); 89 } 90 f[qx+dis[i]][py] = 1; 91 } 92 } 93 else 94 { 95 f[qx][py] = 1; 96 inque(qx,py); 97 { 98 q[d].num = q[p].num+1; 99 sort(); 100 } 101 f[qx][py] = 1; 102 } 103 } 104 if(!f[px][qy]&&qy>0&&qy<=m&&(c[px][qy]=='.'||c[px][qy]=='|'||c[px][qy]=='-'||c[px][qy]=='T')) 105 { 106 if(c[px][qy]=='|'||c[px][qy]=='-') 107 { 108 if(!f[px][qy+dis[i]]&&qy+dis[i]>0&&qy+dis[i]<=m&&(c[px][qy+dis[i]]=='.'||c[px][qy+dis[i]]=='T')) 109 { 110 inque(px,qy+dis[i]); 111 if((!pf&&c[px][qy]=='|')||(pf&&c[px][qy]=='-')) 112 { 113 q[d].num = q[p].num+2; 114 sort(); 115 } 116 else 117 { 118 q[d].num = q[p].num+1; 119 sort(); 120 } 121 f[px][qy+dis[i]] = 1; 122 } 123 } 124 else 125 { 126 f[px][qy] = 1; 127 inque(px,qy); 128 { 129 q[d].num = q[p].num+1; 130 sort(); 131 } 132 f[px][qy] = 1; 133 } 134 } 135 } 136 }while(d!=p); 137 printf("%d\n",q[p].num); 138 } 139 return 0; 140 }