加-1反例:
输入
2 1
3 5
正确输出:
2
你的加-1代码输出:
1
by syex_luoyukai @ 2024-02-18 20:17:40
不加-1反例:
输入
3 2
1 4 1
正确输出:
3
你的不加-1代码输出:
4
by syex_luoyukai @ 2024-02-18 20:22:01
参考代码
```cpp
#include<bits/stdc++.h>
using namespace std;
long long n,m,i,j,k,a[50],ans;
bool f[5100000];
void search(long long g,long long s,long long l)
{
if(g==m)
{
if(f[s]==0)
{
ans++;
}
return;
}
if(l>n)
{
return;
}
search(g+1,s+a[l],l+1);
search(g,s,l+1);
}
int main(){
cin>>n>>m;
for(i=2;i<=sqrt(5000000);i++)
{
if(f[i]==0)
{
for(j=i*i;j<=5000000;j+=i)
{
f[j]=1;
}
}
}
for(i=1;i<=n;i++)
{
cin>>a[i];
}
search(0,0,1);
cout<<ans;
return 0;
}
``````
by syex_luoyukai @ 2024-02-18 20:23:56
@[lihua_miaowu](/user/719614)
by syex_luoyukai @ 2024-02-18 20:24:25
谢谢
by lihua_miaowu @ 2024-02-18 22:32:06