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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #define l 1000000
  5. long long int a[1000010];
  6. long long int b[1000010];
  7. long long int sum,t,n;
  8.    //lcm sum problem
  9. void fun()
  10. {
  11.     for(int i=1;i<=l;i++)
  12.         a[i]=i;
  13.     for(int i=2;i<=l;i++)
  14.  
  15.         //checking multiples of all prime numbers
  16.         if(a[i]==i)
  17.             for(int j=2*i;j<=l;j+=i)
  18.  
  19.             a[j]-=a[j]/i;
  20.             //cout<<a[j]<<endl;
  21.  
  22.  
  23.         //prime numer phi(prime numeber -p)=p-1;//property
  24.         for(int i=2;i<=l;i++)
  25.             if(a[i]==i)
  26.         a[i]=i-1;
  27.  
  28.     for(int i=1;i<=l;i++)
  29.         for(int j=i;j<=l;j+=i)
  30.         b[j]+=i*a[i];
  31. }
  32.  
  33. int main()
  34. {
  35.  
  36.     fun();
  37.     //freopen("3.txt", "r", stdin);
  38.     //freopen("ans3.txt","w",stdout);
  39.  
  40.     int t;
  41.     cin>>t;
  42.     while(t--)
  43.     {
  44.        sum=0;
  45.        cin>>n;
  46.        sum=(1+b[n])* n / 2;
  47.        cout<<sum<<endl;
  48.     }
  49.  
  50. }
  51.  
Runtime error #stdin #stdout 0.55s 18312KB
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https://ideone.com/hwxY1F
language:
C++ 4.3.2 (gcc-4.3.2)
created:
8 years ago
visibility:
secret

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