Submission #1045622

#	Time	Username	Problem	Language	Result	Execution time	Memory
1045622		ezzzay	Odd-even (IZhO11_oddeven)	C++14	0 / 100	0 ms	348 KiB

oddeven

#include <bits/stdc++.h>
 
#define pb push_back
#define endl "\n"
#define mp make_pair 
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define fname ""
#define sz(x) (int)(x.size())
 
typedef long long ll;
 
using namespace std;
 
const ll N = (ll)(5e5) + 322;
const ll INF = (ll)(2e9);
const ll mod = (ll)(1e9) + 7;
const double eps = 1e-9;
 
ll n, l = 0, r = INF, ans;
 
ll calc(ll x) {return (x) * (x + 1) / 2ll;}
 
int main () {
	ios_base :: sync_with_stdio (false); cin.tie(0);
	//freopen(fname".in", "r", stdin);
	//freopen(fname".out", "w", stdout);
	scanf("%lld", &n);
	while (r - l > 1) {
	  ll mid = (r + l) / 2ll;
	  if (calc(mid) >= n) 
	  	r = mid;
	  else
			l = mid;	  
	}         
	ans = n + (n - l - 1);
	printf("%lld", ans);
	return 0;
}

Compilation message (stderr)

oddeven.cpp: In function 'int main()':
oddeven.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |  scanf("%lld", &n);
      |  ~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 100