제출 #249205

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
249205		Dilshod_Imomov	Arranging Shoes (IOI19_shoes)	C++17	15 / 100	34 ms	3200 KiB

shoes

# include <bits/stdc++.h>
# define ll long long
# define speed ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;

const int MAX_N = 100007;

ll count_swaps( vector < int > s ) {
	speed;
	ll n = s.size(), sz = 0;
	/*
	ll ans = 0;
	vector < int > ids, used(n), vc[2 * MAX_N];
	for ( int i = 0; i < n; i++ ) {
		s[i] += MAX_N;
		vc[s[i]].push_back( i );
	}
	// cout << "Done 1" << endl;
	for ( int i = 0; i < n; i++ ) {
		if ( used[i] ) {
			continue;
		}
		s[i] -= MAX_N;
		int l = i, r = *vc[-s[i] + MAX_N].begin();
		// cout << "Done 2 " << l << ' ' << r << endl;
		vc[ s[i] + MAX_N ].erase( vc[ s[i] + MAX_N ].begin() );
		int rr = r;
		used[r] = 1;
		vc[-s[i] + MAX_N].erase( vc[-s[i] + MAX_N].begin() );
		int x = upper_bound( ids.begin(), ids.end(), i ) - ids.begin();
		x = sz - x;
		l += x;
		x = upper_bound( ids.begin(), ids.end(), r ) - ids.begin();
		x = sz - x;
		r += x;
		ans += r - l - 1;
		if ( s[i] > 0 ) {
			ans++;
		}
		sz++;
		ids.push_back( rr );
	}*/
	n /= 2;
	n--;
	return n * (n + 1) / 2;
	// return ans; 
}
/*
int main() {
	ll n;
	cin >> n;
	vector < int > S(2 * n);  
	for ( ll  i = 0; i < 2 * n; i++ ) {
		cin >> S[i];
	}
	cout << count_swaps( S );
}
*/

컴파일 시 표준 에러 (stderr) 메시지

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:10:19: warning: unused variable 'sz' [-Wunused-variable]
  ll n = s.size(), sz = 0;
                   ^~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 15 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15