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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. using ll = long long;
  4. const int MAXA = 1000000;
  5. long long suoc[MAXA + 1];
  6. bool khh( int n){
  7.      if( n < 12) return false;
  8.      int s = 1;
  9.      for( int i = 2 ; i* i <= n ; i++ ){
  10.         if( n % i == 0){
  11.             s +=i;
  12.             if( i!= n / i)
  13.                 s+= n/i;
  14.         }
  15.      }
  16.      return s>n;
  17. }
  18. int main(){
  19.    ios::sync_with_stdio(false);
  20.    cin.tie(nullptr);
  21.    freopen("KHH.INP" , "r" , stdin);
  22.    freopen("KHH.OUT" , "w" , stdout);
  23.    ll a , b;
  24.    cin >> a >> b;
  25.    ll n;
  26.    ll count = 0;
  27.    for( int i = a ; i<= b ; i++ ){
  28.        if( khh(i) ){
  29.             count++;
  30.        }
  31.    }
  32.    cout << count;
  33.    return 0;
  34. }
  35.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/D6GmxO
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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