Submission #1127877

#	Time	Username	Problem	Language	Result	Execution time	Memory
1127877		Chinguun	Odd-even (IZhO11_oddeven)	C++20	0 / 100	1 ms	392 KiB

oddeven

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define ff first
#define ss second
#define pb push_back
#define meta int tm = (tl + tr) / 2, x = i * 2 + 1, y = x + 1

const int N = 2e5 + 7;
const int oo = 1e9;
const int mod = 1e9 + 7;

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;

int a, l, r = oo;

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);

	cin >> a;
	while (l < r) {
		int m = (l + r) / 2;
		if (m * (m + 1) / 2 < a) l = m + 1;
		else r = m;
	} r--;
	cout << a * 2 - r - 1;
	return 0;
}

• Subtask 1: 0 / 100