骑士周游问题C语言
#include<stdio.h>#include<time.h>
#define X 8
#define Y 8
int chess;
int nextxy(int *x,int *y,int count)
{
switch(count)
{
case 0:
if(*x-2>=0 && *y-1>=0 &&chess[*x+2][*y-1]==0)
{
*x -= 2;
*y -= 1;
return 1;
}
break;
case 1:
if (*x-2>=0 && *y+1<=Y-1 && chess[*x+2][*y+1]==0)
{
*x -= 2;
*y += 1;
return 1;
}
break;
case 2:
if (*x-1>=0 && *y+2<=Y-1 && chess[*x+2][*y+1]==0)
{
*x -= 1;
*y += 2;
return 1;
}
break;
case 3:
if (*x+1<=X-1 && *y+2<=Y-1 && chess[*x+2][*y+1]==0)
{
*x += 1;
*y += 2;
return 1;
}
break;
case 4:
if (*x+2<=X-1 && *y+1<=Y-1 && chess[*x+2][*y+1]==0)
{
*x += 2;
*y += 1;
return 1;
}
break;
case 5:
if (*x+2<=X-1 && *y-1>=0 && chess[*x+2][*y+1]==0)
{
*x += 2;
*y -= 1;
return 1;
}
break;
case 6:
if (*x+2<=X-1 && *y+1<=Y-1 && chess[*x+2][*y+1]==0)
{
*x += 2;
*y += 1;
return 1;
}
break;
case 7:
if (*x+1<=X-1 && *y-2<=Y-1 && chess[*x+2][*y+1]==0)
{
*x += 1;
*y -= 2;
return 1;
}
break;
case 8:
if (*x-1>=0 && *y-2>=0 && chess[*x+2][*y+1]==0)
{
*x -= 1;
*y -= 2;
return 1;
}
break;
default:
break;
}
return 0;
}
void print()
{
int i,j;
for(i=0;i<X;i++)
{
for(j=0;j<Y;j++)
{
printf("%2d\t",chess);
}
printf("\n");
}
printf("\n");
}
// 深度优先算法棋盘
//(x,y)为位置坐标
//tag是标记变量,每走一步tag+1
int TravelChessBoard(int x,int y,int tag)
{
int x1 = x, y1 = y, flag = 0, count = 0;
chess = tag;
if(X*Y == tag)
{
print();
return 1;
}
//找到马的下一个可走的坐标(x1,y1),若找到flag=1反之flag=0
flag = nextxy(&x1,&y1,count);
while (0==flag && count<7)
{
count ++;
flag = nextxy(&x1,&y1,count);
}
while (flag)
{
if(TravelChessBoard(x1,y1,tag+1))
{
return 1;
}
//继续找马的下一步可走坐标,同上
x1 = x;
y1 = y;
count ++;
flag =nextxy(&x1,&y1,count);
while (0==flag && count<7)
{
count ++;
flag = nextxy(&x1,&y1,count);
}
}
if (0==flag)
{
chess = 0;
}
return 0;
}
int main()
{
int i,j;
clock_t start,finish;
start = clock();
for(i=0;i<X;i++)
{
for(j=0;j<Y;j++)
{
chess = 0;
}
if( !TravelChessBoard(2, 0, 1) )
{
printf("抱歉,失败咯!\n");
}
finish = clock();
printf("\n本次计算耗时:%f秒\n\n",(double)(finish-start)/CLOCKS_PER_SEC);
}
return 0;
}
想知道这个case的顺序应该不会影响结果吧,但并不是很清楚代码问题在哪里出错了 本帖最后由 gaopool 于 2022-11-22 16:14 编辑
我已经去掉那个case6了,但还是有问题
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