제출 #488224

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
488224		ssense	Arranging Shoes (IOI19_shoes)	C++14	25 / 100	17 ms	1868 KiB

shoes

#include <bits/stdc++.h>
//#include "shoes.h"
#define startt ios_base::sync_with_stdio(false);cin.tie(0);
typedef long long  ll;
using namespace std;
#define vint vector<int>
#define all(v) v.begin(), v.end()
#define MOD 1000000007
#define MOD2 998244353
#define MX 1000000000
#define MXL 1000000000000000000
#define PI (ld)2*acos(0.0)
#define pb push_back
#define sc second
#define fr first
//#define int long long
//#define endl '\n'
#define ld long double
#define NO cout << "NO" << endl
#define YES cout << "YES" << endl

long long count_swaps(vector<int> s)
{
	ll n = s.size()/2;
	if(n > 1000)
	{
		return n*(n-1)/2;
	}
	else if(n <= 8)
	{
		vint a;
		for(auto x : s)
		{
			if(x < 0) a.pb(x);
		}
		int offans = MX;
		do {
			vint scop = s;
			int ans = 0;
			for(int i = 0; i < n; i++)
			{
				int idx = 0;
				while(scop[idx] != a[i])
				{
					idx++;
				}
				ans+=idx;
				scop.erase(scop.begin()+idx);
				idx = 0;
				while(scop[idx] != -a[i])
				{
					idx++;
				}
				ans+=idx;
				scop.erase(scop.begin()+idx);
			}
			offans = min(ans, offans);
		} while (next_permutation(all(a)));
		return offans;
	}
	int ans = 0;
	while(s.size() > 0)
	{
		int i = 0;
		while(s[i] > 0)
		{
			i++;
		}
		ans+=i;
		int sz = -s[i];
		s.erase(s.begin()+i);
		i = 0;
		while(s[i] != sz)
		{
			i++;
		}
		ans+=i;
		s.erase(s.begin()+i);
	}
	return ans;
}
/*
int main()
{
	int n;
	cin >> n;
	vint a(2*n);
	for(int i = 0; i < 2*n; i++)
	{
		cin >> a[i];
	}
	cout << count_swaps(a);
}
 */
/*
5
-2 -1 1 2 -1 1 -2 -1 1 2
 */

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