```cpp
#include<bits/stdc++.h>
using namespace std;
int main()
{
long long n=0;
int a[10000]={0};
cin>>n;
int pd=0;
for(int i=2;i<n;i++){
for(int j=2; j<=sqrt(i); j++){
if(i%j==0)pd=1;break;
}
if(pd==0)a[i]=1;
pd=0;
}
for(int i=4;i<=n;i+=2){
for(int j=2; j<n; j++){
if(a[j]==1&&a[i-j]==1){
printf("%d=%d+%d\n",i,j,i-j);
break;
}
}
}
}
``````
by conancat @ 2023-12-05 20:13:08
@[1145141919810HOMO11](/user/1004337)
by conancat @ 2023-12-05 20:15:47