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Time Limit: 20000/10000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 23172 Accepted Submission(s): 5710
1 # include<cstdio> 2 # include<iostream> 3 # include<cstring> 4 # include<queue> 5 6 using namespace std; 7 8 # define MAX 1234 9 10 struct node 11 { 12 int x,y; 13 int direction; 14 int turn; 15 }; 16 17 int flag; 18 int x11,x22,y11,y22; 19 int book[MAX][MAX][4]; 20 int grid[MAX][MAX]; 21 int nxt[4][2] = {{0,1},{-1,0},{0,-1},{1,0} }; 22 23 int n,m; 24 queue<node>Q; 25 26 int can_move ( int x,int y ) 27 { 28 if ( x>=1&&x<=n&&y>=1&&y<=m ) 29 return 1; 30 else 31 return 0; 32 } 33 34 void init() 35 { 36 while ( !Q.empty() ) 37 { 38 Q.pop(); 39 } 40 memset(book,0,sizeof(book)); 41 } 42 43 void bfs ( node start ) 44 { 45 init(); 46 Q.push(start); 47 while ( !Q.empty() ) 48 { 49 node now = Q.front(); 50 Q.pop(); 51 if ( now.turn > 2 ) 52 continue; 53 if ( now.x==x22&&now.y==y22 ) 54 { 55 flag = 1; 56 return; 57 } 58 59 for ( int i = 0;i < 4;i++ ) 60 { 61 int tx = now.x+nxt[i][0], ty = now.y+nxt[i][1]; 62 if ( can_move(tx,ty)==0||book[now.x][now.y][i]==1 ) 63 continue; 64 node newnode; 65 newnode.x = tx; newnode.y = ty; 66 if ( (tx==x22&&ty==y22)||grid[tx][ty]==0 ) 67 { 68 if ( now.direction == -1||now.direction==i ) 69 { 70 newnode.direction = i; 71 newnode.turn = now.turn; 72 } 73 else 74 { 75 newnode.direction = i; 76 newnode.turn = now.turn+1; 77 } 78 book[now.x][now.y][i] = 1; 79 Q.push(newnode); 80 } 81 } 82 } 83 } 84 85 86 87 88 int main(void) 89 { 90 while ( scanf("%d%d",&n,&m)!=EOF ) 91 { 92 if ( n==0&&m==0 ) 93 break; 94 for ( int i = 1;i <= n;i++ ) 95 { 96 for ( int j = 1;j <= m;j++ ) 97 { 98 scanf("%d",&grid[i][j]); 99 } 100 } 101 102 int q;scanf("%d",&q); 103 while ( q-- ) 104 { 105 flag = 0; 106 scanf("%d%d%d%d",&x11,&y11,&x22,&y22); 107 node start; 108 start.x = x11; start.y = y11; start.turn = 0;start.direction = -1; 109 if ( (grid[x11][y11]==grid[x22][y22])&&grid[x11][y11]!=0 ) 110 bfs(start); 111 if ( flag ) 112 printf("YES\n"); 113 else 114 printf("NO\n"); 115 } 116 } 117 118 return 0; 119 }
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原文地址:http://www.cnblogs.com/wikioibai/p/4513481.html