结果long long，棋盘≤30\*30
by Victory_Defeat @ 2017-12-07 20:50:10
谢谢
还有个问题，我的程序会re，求大佬们解释
```cpp
#include<iostream>
#include<cmath>
#include<vector>
#include<map>
#include<algorithm>
#include<string>
#include<cstdlib>
#include<queue>
#include<climits>
#include<set>
#include<cstring>
using namespace std;
struct position
{
int xx;
int yy;
};
position final,horse;
bool control[100][100];
void in();
long long find(int x,int y);
int main()
{
in();
cout << find(final.xx,final.yy);
return 0;
}
void in()
{
cin >> final.xx >> final.yy >> horse.xx >> horse.yy;
memset(control,0,sizeof(control));
control[horse.xx][horse.yy] = 1;
control[horse.xx+2][horse.yy+1] = 1;
control[horse.xx+2][horse.yy-1] = 1;
control[horse.xx+1][horse.yy+2] = 1;
control[horse.xx+1][horse.yy-2] = 1;
control[horse.xx-1][horse.yy+2] = 1;
control[horse.xx-1][horse.yy-2] = 1;
control[horse.xx-2][horse.yy+1] = 1;
control[horse.xx-2][horse.yy-1] = 1;
}
long long find(int x,int y)
{
if(control[x][y])
{
return 0;
}
if(x < 0 || y < 0)
{
return 0;
}
if(x == 0 && y == 0)
{
return 1;
}
long long ans = find(x,y-1) + find(x-1,y);
cout << ans << endl;
return ans;
}
```
by HygoK67 @ 2017-12-07 20:52:41
我试出了2个wa和3个tle！
PS：本蒟蒻AC代码：
```cpp
#include<cstdio>
long long x,y,n,m,a[30][30],f[30][30];
void z(long long x,long long y)
{
f[x][y]=1;
f[x-1][y-2]=1;
f[x-2][y-1]=1;
f[x-2][y+1]=1;
f[x-1][y+2]=1;
f[x+1][y-2]=1;
f[x+2][y-1]=1;
f[x+2][y+1]=1;
f[x+1][y+2]=1;
}
void work()
{
a[1][0]=1;
for(int i=1;i<=n+1;i++)
for(int j=1;j<=m+1;j++)
if(f[i-1][j-1]) a[i][j]=0;
else a[i][j]=a[i-1][j]+a[i][j-1];
printf("%lld",a[n+1][m+1]);
}
int main()
{
scanf("%lld%lld%lld%lld",&n,&m,&x,&y);
z(x,y);
work();
}
```
by Victory_Defeat @ 2017-12-07 21:17:27
一脸懵逼的我用了高精度
然后
屏幕上
火辣辣一片
by retired_treasure @ 2018-01-01 21:03:05