Submission #992470

#	Time	Username	Problem	Language	Result	Execution time	Memory
992470		vqpahmad	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1096 ms	5332 KiB

shoes

#include<bits/stdc++.h>
using namespace std;
#ifdef ONPC
#include"debug.h"
#else
#define debug(...) 42
#endif
#define ll long long
#define pii pair<int,int>
#define F first
#define S second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
const int mod = 1e9 + 7;
const int MAXN = 1e6 + 15;
const int inf = 0x3f3f3f3f;
const ll INF = 0x3f3f3f3f3f3f3f3f;

long long count_swaps(vector<int> S){
	auto a = S;
	sort(all(a));
	int n = sz(a);
	vector<int> p;
	for (int x : S) if (x > 0) p.pb(x);
	vector<int> brut;
	ll ans = 1e18;
	do {
		brut = S;
		a.clear();
		for (int i = 0; i < sz(p); i++){
			a.pb(-p[i]);
			a.pb(p[i]);
		}
		bool good = 1;
		for (int i = 1; i < n; i += 2){
			good &= a[i] + a[i - 1] == 0;
			good &= a[i] > a[i - 1];
		}
		if (!good) continue;
		ll cost = 0;
		for (int i = 0; i < n; i++){
			if (a[i] == brut[i]) continue;
			for (int j = i; j < n; j++){
				if (a[i] == brut[j]){
					for (int k = j; k > i; k--){
						cost++;
						swap(brut[k], brut[k - 1]);
					}
					break;
				}
			}
		}
		ckmin(ans, cost);
	} while (next_permutation(all(p)));
	return ans;
}

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