Submission #337842

#	Time	Username	Problem	Language	Result	Execution time	Memory
337842		tengiz05	Odd-even (IZhO11_oddeven)	C++17	0 / 100	1 ms	384 KiB

oddeven

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define pii pair<int, int>
#define ff first
#define ss second
#define PI acos(-1)
#define ld long double
template <class T> bool ckmin(T& a, const T& b) {return a > b ? a = b, true : false;}
template <class T> bool ckmax(T& a, const T& b) {return a < b ? a = b, true : false;}
const int mod = 1e9+7, N = 2e5+5;
int msb(int val){return sizeof(int)*8-__builtin_clzll(val);}
int a[N], n, m, k;

void solve(int test_case){
	int i, j;
	cin >> n;
	int l=0, r=n;
	while(l+1 < r){
		int mid = (l+r)/2;
		if(mid*(mid+1)/2 < n){
			l = mid;
		}else r = mid;
	}
	int lst = l*(l+1)/2;
	int start = lst*2-l+1;
	start += (n-lst-1)*2;
	cout << start << '\n';
	return;
}

signed main(){
	FASTIO;
#define MULTITEST 0
#if MULTITEST
	int _T;
	cin >> _T;
	for(int T_CASE = 1; T_CASE <= _T; T_CASE++)
		solve(T_CASE);
#else
	solve(1);
#endif
	return 0;
}

Compilation message (stderr)

oddeven.cpp: In function 'void solve(long long int)':
oddeven.cpp:19:6: warning: unused variable 'i' [-Wunused-variable]
   19 |  int i, j;
      |      ^
oddeven.cpp:19:9: warning: unused variable 'j' [-Wunused-variable]
   19 |  int i, j;
      |         ^

• Subtask 1: 0 / 100