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  1. #include <iostream>
  2. #include <queue>
  3.  
  4. using namespace std;
  5.  
  6. #define ll long long
  7. #define pb push_back
  8. #define fi first
  9. #define se second
  10.  
  11. const ll MAXN = 1e4 + 5;
  12. const ll MOD = 1e9 + 7;
  13. const ll INF = 1e9 + 7;
  14.  
  15. void FastIO(){
  16.     ios_base::sync_with_stdio(false);
  17.     cin.tie(NULL); cout.tie(NULL);
  18. }
  19.  
  20. void fre(){
  21.     freopen("CAU1.inp", "r", stdin);
  22.     freopen("CAU1.out", "w", stdout);
  23. }
  24.  
  25. ll n, check[MAXN]{}, cnt = 0;
  26. queue<ll> q;
  27.  
  28. int main()
  29. {
  30.     FastIO();
  31.     fre();
  32.     cin >> n;
  33.     q.push(n);
  34.     check[n] = 1;
  35.     while(!q.empty()){
  36.         ll k = q.front();
  37.         q.pop();
  38.         for(int i=1; i*i<=k; ++i)
  39.             if(k % i == 0){
  40.                 ll tmp = (i - 1) * (k/i + 1);
  41.                 if(check[tmp] == 0){
  42.                     ++cnt;
  43.                     check[tmp] = 1;
  44.                     q.push(tmp);
  45.                 }
  46.             }
  47.     }
  48.     cout << cnt;
  49.     return 0;
  50. }
  51.  
Success #stdin #stdout 0.01s 5296KB
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https://ideone.com/QuzFtS
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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