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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define getchar_unlocked getchar()
  5.  
  6.  void fastscan(ll &x)
  7.     {
  8.         bool neg=false;
  9.         register ll c;
  10.         x =0;
  11.         c=getchar();
  12.         if(c=='-')
  13.         {
  14.             neg = true;
  15.             c=getchar();
  16.         }
  17.         for(;(c>47 && c<58);c=getchar())
  18.             x = (x<<1) + (x<<3) +c -48;
  19.         if(neg)
  20.             x *=-1;
  21.     }
  22.  
  23. ll gcd(ll u,ll v)
  24. {
  25.     ll k=0,t=0,i;
  26.     while (!(u&1) && !(v&1))
  27.     {
  28.           k++;
  29.           u>>=1;
  30.           v>>=1;
  31.     }
  32.     if (u&1)
  33.        t=u;
  34.     else
  35.         t=-v;
  36.     do
  37.     {
  38.         while (!(t&1))
  39.               t>>=1;
  40.         if (t>0)
  41.            u=t;
  42.         else
  43.             v=-t;
  44.         t=u-v;
  45.     }while (t);
  46.     for (i=0;i<k;i++)
  47.         u<<=1;
  48.     return(u);
  49. }
  50.  
  51. ll lcm(ll m, ll n)
  52. {
  53.         return m / gcd(m, n) * n;
  54. }
  55.  
  56. int main(){
  57.     ll t, n, a,b;
  58.  
  59.  
  60.     fastscan(t);
  61.     while(t--){
  62.         fastscan(n);
  63.         ll sum =0;
  64.         if(n==1){
  65.             cout <<"1\n";
  66.         } else {
  67.             for(ll i=1;i<n;i++){
  68.                 for(ll j = i+1;j<=n;j++){
  69.                     if(lcm(i,j)==n){
  70.                         ll c = i+j;
  71.                         sum += c;
  72.                     }
  73.                 }
  74.             }
  75.             cout <<sum<<"\n";
  76.         }
  77.  
  78.     }
  79.  
  80.     return 0;
  81.  
  82. }
  83.  
Success #stdin #stdout 0s 3140KB
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https://ideone.com/1REdZn
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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