Submission

Score: 50

User: iAOMNC

Problemset: สามสหาย

Language: cpp

Time: 1.095 second

Submitted On: 2025-11-07 16:40:24

#include<bits/stdc++.h>
using namespace std;
vector<bool> chk(15000,1);
int ans=0;
void brrpatapim(int a,int c,int y,int geb)
{
if(y==3&&chk[geb]>0)
{
ans++;
return ;
}
else if(y==3)
{
return;
}
for(int i=a;i<=c;i++)
{
brrpatapim(i,c,y+1,geb+i);

}
return ;
}

int main()
{
int a;
cin >> a;
int m=1;
int c;
cin >> c;


for(int i=2;i<450;i++)
{
if(chk[i]>0)
{
for(int j=i+i;j<=c*3;j=j+i)
{
chk[j]=0;
}
}
}

brrpatapim(a,c,0,0);
cout << ans;
}