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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long 
  4. #define dbg(x) cout<<#x<<" : "<<x<<endl
  5. #define rep(i,a,b) for(int i=(a);i<=(b);i++)
  6. #define inf 1000000000000000000
  7. priority_queue<ll,vector<ll>,greater<int>> qp;
  8. priority_queue<ll> qr;
  9. #define maxn 100005
  10. #define mod 1000000007
  11. #define cnt_ones __builtin_popcount
  12. int main(){
  13.     // freopen("input.txt","r",stdin);
  14.     // freopen("output.txt","w",stdout);
  15.     ll S;
  16.     cin>>S;
  17.     ll maax = (ll)sqrt(8*S+1);
  18.     maax = (maax-1)/2;
  19.     for(ll n=maax;n>=1;n--){
  20.         ll tu = 2*S-n-n*n;
  21.         ll mau = 2*(n+1);
  22.         if(tu%mau==0){
  23.             if(tu==0) cout<<n;
  24.             else cout<<n+1;
  25.             return 0;
  26.         }
  27.     }
  28.     cout<<0;
  29.     return 0;
  30. }
Success #stdin #stdout 0.03s 5564KB
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13267744
https://ideone.com/Pdtddr
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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