#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX_VERTEX_NUM 10
#define X 8
#define Y 8
int chess[X][Y];
int nextxy(int *x, int *y, int count) {
switch (count)
{
case 0:
if (*x + 1 <= X - 1 && *y - 2 >= 0 && chess[*x + 1][*y - 2] == 0)
{
*x += 1;
*y -= 2;
return 1;
}
break;
case 1:
if (*x + 2 <= X - 1 && *y - 1 >=0 && chess[*x + 2][*y - 1] == 0)
{
*x += 2;
*y -= 1;
return 1;
}
break;
case 2:
if (*x + 2 <= X - 1 && *y + 1 <= Y - 1 && chess[*x + 2][*y + 1] == 0)
{
*x += 2;
*y += 1;
return 1;
}
break;
case 3:
if (*x + 1 <= X - 1 && *y + 2 <= Y-1 && chess[*x + 1][*y + 2] == 0)
{
*x += 1;
*y += 2;
return 1;
}
break;
case 4:
if (*x - 1 >= 0 && *y + 2 <= Y-1 && chess[*x -1][*y+2] == 0)
{
*x -= 1;
*y += 2;
return 1;
}
break;
case 5:
if (*x - 2 >= 0 && *y + 1 <= Y - 1 && chess[*x - 2][*y + 1] == 0)
{
*x -= 2;
*y += 1;
return 1;
}
break;
case 6:
if (*x - 2 >= 0 && *y - 1 >= 0 && chess[*x - 2][*y - 1] == 0)
{
*x -= 2;
*y -= 1;
return 1;
}
break;
case 7:
if (*x - 1 >= 0 && *y - 2 >=0 && chess[*x - 1][*y - 2] == 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[i][j]);
}
printf("\n");
}
printf("\n");
}
int TraveChessBoard(int x, int y, int tag) {
chess[x][y] = tag;
int x1 = x, y1 = y, flag = 0, count = 0;
if (tag == X*Y)
{
print();
return 1;
}
flag = nextxy(&x1, &y1, count);
while (0 == flag && count<7)
{
count++;
flag = nextxy(&x1, &y1, count);
}
//find ma next(x1,y1),find ok flag=1;
while (flag)
{
if (TraveChessBoard(x1, y1, tag + 1)) {
return 1;
}
x1 = x;
y1 = y;
count++;
flag = nextxy(&x1, &y1, count);
while (0 == flag && count<7)
{
count++;
flag = nextxy(&x1, &y1, count);
}
//xia yi bu zuo biao
}
if (flag == 0)
{
chess[x][y] = 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[i][j] = 0;
}
}
if (!TraveChessBoard(2, 0, 1))
{
printf("bao qian,shi bai le");
}
finish = clock();
printf("\nben ci ji suan shi jian:%fmiao\n\n", (double)((finish - start) / CLOCKS_PER_SEC));
return 0;
}
这是代码,感觉没问题,但是运行在88,在起始点为2,0点一直是死循环,不知道为什么,有时候棋盘小点,起始点选好又可以得出正确答案,有时候又得不出,有时候又是死循环,不知道为什么,理论在88的棋盘,2,0起始点肯定有解的啊,调试了半天,算法感觉也没写错,不知道怎么回事。。。。费解!!
唉,郁闷了,就是算法太复杂一直在走。。我以为死循环了,代码没错,回溯法,不过会耗时太久啊。。。