Submission #1112861

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112861		Pishka12	Odd-even (IZhO11_oddeven)	C++14	0 / 100	1 ms	336 KiB

oddeven

#include <bits/stdc++.h>
#define ll long long
#define f first
#define s second
using namespace std;
 
int main() 
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    ll n;
    cin>>n;
    n--;
    ll l = 0,r = 1e9,le = 0;
    while(l<=r) {
      ll m = (l+r)/2;
      if (m*(m+1)/2 + m > n) {
        r= m-1;
      }
      else {
        l = m+1;
        le = m;
      }
    }
    ll ans = 1;
    ans += le*(le+1) + le;
    n -= le*(le+1)/2 + le;
    if (n >= 1) {
      ans++;
      n--;
      ans+= n*2;
    }
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 0 / 100