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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.     int t;
  6.     cin>>t;
  7.     while(t--)
  8.     {
  9.         int m,n,ans=0,i,j;
  10.         cin>>m>>n;
  11.         int prime[n+1];
  12.         for(int i=2;i<=n;i++)
  13.             prime[i]=1;
  14.         prime[1]=0;
  15.         for(i=2;i<=sqrt(n);i++)
  16.         {
  17.             if(prime[i]==1)
  18.             {
  19.                 for(j=i+i;j<=n;j+=i)
  20.                 {
  21.                     prime[j]=0;
  22.                 }
  23.             }
  24.         }
  25.         for(int i=m;i<=n;i++)
  26.             if(prime[i]==1)
  27.                 ans+=i;
  28.         cout<<ans<<endl;
  29.     }
  30. }
  31.  
Success #stdin #stdout 0s 3472KB
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stdin
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2
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stdout
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https://ideone.com/Q8TXj1
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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