openjudge-NOI 2.5-1700 八皇后问题
题目链接:http://noi.openjudge.cn/ch0205/1700/
题解:
经典深搜题目……
1 #include<cstdio> 2 bool a[9][9]; 3 int num; 4 void print() 5 { 6 printf("No. %d\n",num); 7 for(int i=1;i<=8;i++) 8 { 9 for(int j=1;j<=8;j++) 10 { 11 printf("%d ",a[j][i]); 12 } 13 printf("\n"); 14 } 15 } 16 int check(int x,int y) 17 { 18 int tmp1,tmp2; 19 tmp1=1;tmp2=y-x+1; 20 for(;tmp1<=x;tmp1++,tmp2++) 21 { 22 if(tmp2>=1&&tmp2<=8&&a[tmp1][tmp2]==true)return 0; 23 } 24 tmp1=1;tmp2=y+x-1; 25 for(;tmp1<=x;tmp1++,tmp2--) 26 { 27 if(tmp2>=1&&tmp2<=8&&a[tmp1][tmp2]==true)return 0; 28 } 29 tmp1=1;tmp2=y; 30 for(;tmp1<=x;tmp1++) 31 { 32 if(tmp2>=1&&tmp2<=8&&a[tmp1][tmp2]==true)return 0; 33 } 34 return 1; 35 } 36 void dfs(int dep) 37 { 38 if(dep==9) 39 { 40 num++; 41 print(); 42 } 43 else 44 { 45 for(int i=1;i<=8;i++) 46 { 47 if(dep==1||check(dep,i)==1) 48 { 49 a[dep][i]=true; 50 dfs(dep+1); 51 a[dep][i]=false; 52 } 53 } 54 } 55 } 56 int main() 57 { 58 dfs(1); 59 return 0; 60 }