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 | 作者: jaychou [jaychou]
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| 问题很简单，在国际象棋的棋盘上最多能放几个互不影响的皇后（好像是8个）？有几种放法？请用C语言解答，谢谢！谢绝与此帖无关的回复！ [此贴被 冰之狼(jaychou) 在 10月01日18时49分 编辑过] |
| 地主 发表时间: 04-10-01 18:39 |
 | 回复: xiaoqing09 [xiaoqing09] 论坛用户 |
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#include <stdio.h> #include <math.h> void work(int a[8][8],int row); int b[8]={0}; int count=1; main() { int a[8][8]={0}; work(a,0); } void work(int a[8][8],int row) { int i,j; if(row==8) { printf("\n\n-----%d answer------\n",count++); for(i=0;i<8;i++) { for(j=0;j<8;j++) printf("%d ",a[i][j]); printf("\n"); } getchar(); return; } for(i=0;i<8;i++) { for(j=0;j<row;j++) if(i==b[j]||fabs(i-b[j])==fabs(row-j)) break; if(j==row) { a[row][i]=1; b[row]=i; work(a,row+1); a[row][i]=0; b[row]=0; } } } |
| B1层 发表时间: 04-10-02 18:25 |
 | 回复: hannyu [hannyu]  论坛用户 |
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回溯法的典型应用 |
| B2层 发表时间: 04-10-02 21:51 |
 | 回复: fdgdfghfh [fdgdfghfh]  论坛用户 |
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int a[7][8]; int f(int *p) { int *q =p; int ok =1,i,j,s=0; q=p; for(i=0;i<8;i++) { for(j=0;j<8;j++) { s=s+*q; q=q+8; } if(s>1) return 0; s=0; q=p+i+1; } q=p; for(i=0;i<8;i++) { for(j=0;j<8-i;j++) { s=s+*q; q=q+9; } if(s>1) return 0; s=0; q=p+i+1; } s=0; q=p+63; for(i=0;i<8;i++) { for(j=0;j<8-i;j++) { s=s+*q; q=q-9; } if(s>1) return 0; s=0; q=p+63-i-1; } s=0; q=p+7; for(i=0;i<8;i++) { for(j=0;j<8-i;j++) { s=s+*q; q=q+7; } if(s>1) return 0; s=0; q=p+7-i-1; } q=p+56; for(i=0;i<8;i++) { for(j=0;j<8-i;j++) { s=s+*q; q=q-7; } if(s>1) return 0; s=0; q=p+56+i+1; } return ok; } main() {int count=0; int i,j,k,l,m,n,z,x,q,w,*pp; for(i=0;i<8;i++) for(j=0;j<8;j++) a[i][j]=0; pp=&a[0][0]; for(q=0;q<4;q++) for(w=0;w<8;w++) for(k=0;k<8;k++) for(l=0;l<8;l++) for(m=0;m<8;m++) for(n=0;n<8;n++) for(z=0;z<8;z++) for(x=0;x<8;x++) for(x=0;x<8;x++) { a[0][q]=1; a[1][w]=1; a[2][k]=1; a[3][l]=1; a[4][m]=1; a[5][n]=1; a[6][z]=1; a[7][x]=1; if(f(pp)==1) { count++; for(i=0;i<8;i++) { for(j=0;j<8;j++) cout<<a[i][j]<<"\t"; cout<<"\n"; } cout<<"\n"; } for(i=0;i<8;i++) for(j=0;j<8;j++) a[i][j]=0; } cout<<count; } [此贴被 fdgdfghfh(fdgdfghfh) 在 10月04日00时50分 编辑过] |
| B3层 发表时间: 04-10-04 00:32 |
| 回复: fdgdfghfh [fdgdfghfh] 论坛用户 |
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| B4层 发表时间: 04-10-04 00:46 |
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