C++实现骑士走棋盘算法

#include <stdio.h>
 
int pos[8][8] = { 0 };
 
int travel(int, int);
 
int travel(int x, int y) {
 int i, j, k, l, m;
 int tmpX, tmpY;
 int count, min, tmp;
 
 //骑士可走的八个方向(顺时针)
 int ktmoveX[8] = { 1, 2, 2, 1, -1, -2, -2, -1 };
 int ktmoveY[8] = { -2, -1, 1, 2, 2, 1, -1, -2 };
 
 //测试下一步坐标
 int nextX[8] = { 0 };
 int nextY[8] = { 0 };
 
 //记录每个方向的出路的个数
 int exists[8] = { 0 };
 
 //起始用1标记位置
 i = x;
 j = y;
 pos[i][j] = 1;
 
 //遍历棋盘
 for (m = 2; m <= 64; m++) {
  //初始化八个方向出口个数
  for (l = 0; l < 8; l++) {
   exists[l] = 0;
  }
  l = 0; //计算可走方向
 
      //试探八个方向
  for (k = 0; k < 8; k++) {
   tmpX = i + ktmoveX[k];
   tmpY = j + ktmoveY[k];
   //边界 跳过
   if (tmpX < 0 || tmpY < 0 || tmpX>7 || tmpY>7) {
    continue;
   }
   //可走 记录
   if (pos[tmpX][tmpY] == 0) {
    nextX[l] = tmpX;
    nextY[l] = tmpY;
    l++;    //可走方向加1
   }
  }
  count = l;
  //无路可走 返回
  if (count == 0) {
   return 0;
   //一个方向可走 标记
  }
  else if (count == 1) {
   min = 0;
   //找出下个位置出路个数
  }
  else {
   for (l = 0; l < count; l++) {
    for (k = 0; k < 8; k++) {
     tmpX = nextX[l] + ktmoveX[k];
     tmpY = nextY[l] + ktmoveY[k];
     if (tmpX < 0 || tmpY < 0 || tmpX>7 || tmpY>7) {
      continue;
     }
     if (pos[tmpX][tmpY] == 0) {
      exists[l]++;
     }
    }
   }
   //找出下个位置出路最少的方向
   min = 0;
   tmp = exists[0];
   for (l = 0; l < count; l++) {
    if (exists[l] < tmp) {
     tmp = exists[l];
     min = l;
    }
   }
  }
  //用序号标记走过的位置
  i = nextX[min];
  j = nextY[min];
  pos[i][j] = m;
 }
 return 1;
}
 
int main()
{
 int i, j, startX, startY;
 while (1)
 {
  printf("输入起始点：");
  scanf("%d%d", &startX, &startY);
  if (travel(startX, startY)) {
   printf("游历完成！\n");
  }
  else {
   printf("游历失败！\n");
  }
  for (i = 0; i < 8; i++) {
   for (j = 0; j < 8; j++) {
    printf("%2d ", pos[i][j]);
   }
   printf("\n");
  }
  printf("\n");
 }
 
 return 0;
}