~~难怪洛谷说今天运势大凶。。。~~
by Czero2023 @ 2023-07-26 14:35:33
捞一捞吧大神们
by Czero2023 @ 2023-07-26 14:36:04
数组没有初始化
by qianwanlang @ 2023-07-26 14:48:00
数组最好开全局，不要开局部
by qianwanlang @ 2023-07-26 14:48:38
@[qianwanlang](/user/556281)
全WA了。。
by Czero2023 @ 2023-07-26 16:35:03
原来是数组越界，可还是60分
```
#include <iostream>
using namespace std;
long long a[21][21]={0};
bool flag[21][21]={0};
int main()
{
int bx,by,mx,my;cin>>bx>>by>>mx>>my;
a[0][0]=1;
flag[mx][my]=1;flag[mx+1][my+2]=1;flag[mx-1][my+2]=1;
flag[mx+2][my+1]=1;flag[mx-2][my+1]=1;flag[mx+2][my-1]=1;
flag[mx-2][my-1]=1;flag[mx-1][my-2]=1;flag[mx+1][my-2]=1;//暴力排除马点
for(int i=0;i<=bx;i++)
{
for(int j=0;j<=by;j++)
{
if(flag[i][j]==1)continue;
if(i-1>=0&&j-1>=0)a[i][j]+=a[i-1][j]+a[i][j-1];
else if(i-1>=0&&j-1<0)a[i][j]+=a[i-1][j];
else if(i-1<0&&j-1>=0)a[i][j]+=a[i][j-1];//防越界
}
}
cout<<a[bx][by];
return 0;
}
```
by Czero2023 @ 2023-07-26 16:50:16
@[qianwanlang](/user/556281) 这已经初始化了吧
by Czero2023 @ 2023-07-26 16:51:43
@[Czero2023](/user/1019983)
开全局还是60啊
by Czero2023 @ 2023-07-26 16:52:16
```cpp
#include <iostream>
using namespace std;
long long a[21][21]={0};
bool flag[21][21];
int main()
{
int bx,by,mx,my;cin>>bx>>by>>mx>>my;
a[0][0]=1;
flag[mx][my]=1;
flag[mx+1][my+2]=1;
if(mx-1>=0)flag[mx-1][my+2]=1;
flag[mx+2][my+1]=1;
if(mx-2>=0)flag[mx-2][my+1]=1;
if(my-1>=0)flag[mx+2][my-1]=1;
if(mx-2>=0&&my-1>=0)flag[mx-2][my-1]=1;
if(mx-1>=0&&my-2>=0)flag[mx-1][my-2]=1;
if(my-2>=0)flag[mx+1][my-2]=1;//暴力排除马点
//cout<<"**"<<flag[1][20]<<"**";
for(int i=0;i<=bx;i++)
{
for(int j=0;j<=by;j++)
{
if(flag[i][j]==1||(i==0&&j==0))continue;
if(i-1>=0&&j-1>=0)a[i][j]=a[i-1][j]+a[i][j-1];
else if(i-1>=0&&j-1<0)a[i][j]=a[i-1][j];
else if(i-1<0&&j-1>=0)a[i][j]=a[i][j-1];//防越界
}
/*
for(int h=0;h<=bx;h++)
{
for(int g=0;g<=by;g++)
{
cout<<a[h][g]<<" ";
}
cout<<endl;
}cout<<endl;*/
}
cout<<a[bx][by];//56477193663
//56477364570
return 0;
}
```
**你判断控制点的时候越界了**
by GYQYTYY @ 2023-07-26 19:50:54
这样就可以了
by GYQYTYY @ 2023-07-26 19:51:24