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답안 #337843

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
337843 2020-12-22T02:56:42 Z tengiz05 홀-짝 수열 (IZhO11_oddeven) C++17
0 / 100
 1 ms 364 KB 
#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 < mod && 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

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 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 0 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 0 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 0 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 0 ms 364 KB Output is correct
13 Incorrect 1 ms 364 KB Output isn't correct
14 Halted 0 ms 0 KB -