【转】http://blog.youkuaiyun.com/zxy_snow/article/details/5741881
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int state[9][9];
int count[9][9];
int Queue[100000];
int step[8][2] = {1,2, 1,-2, -1,2, -1,-2, 2,1, 2,-1, -2,1, -2,-1};
int head,tail;
int push(int x)
{
Queue[head++] = x;
}
int pop(void)
{
return Queue[tail++];
}
int Qempty(void)
{
if( head == tail )
return 1;
return 0;
}
void init(void)
{
head = 0; tail = 0;
memset( state,0,sizeof(state) );
memset( count,0,sizeof(count) );
memset( Queue,0,sizeof(Queue) );
}
int main(void)
{
int a,b,x,y,temp,tempa,tempx,ta,tx,i;
char ch1,ch2,n;
while( scanf("%c%d %c%d%c",&ch1,&x,&ch2,&y,&n)!=EOF ) //这点很纠结,因为有个回车,不再输入一个回车的话,会错
{
init();
a = ch1 - 'a' + 1;
b = ch2 - 'a' + 1;
push(a); push(x);
state[a][x] = 1;
while( !Qempty() )
{
tempa = pop();
tempx = pop();
if( tempa == b && tempx == y)
break;
for(i=0; i<8; i++)//8个方向,用循环一一调用,这点很值得学习!
{
ta = tempa + step[i][0];
tx = tempx + step[i][1];
if(state[ta][tx] == 0 && ta>=1 && ta<=8 && tx>=1 && tx<=8 )
{
push(ta); push(tx);
state[ta][tx] = 1;
count[ta][tx] = count[tempa][tempx] + 1;
}
}
}
printf("To get from %c%d to %c%d takes %d knight moves./n",ch1,x,ch2,y,count[tempa][tempx]);
}
system("pause");
return 0;
}