Submission #808713

#	Time	Username	Problem	Language	Result	Execution time	Memory
808713		KemalK	Arranging Shoes (IOI19_shoes)	C++17	50 / 100	1080 ms	3156 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
int n;
long long count_swaps(std::vector<int> s) {
	n = s.size();
	if (n == 2){
		if (s[0] < 0){
			return 0;
		}
		return 1;
	}
	ll ans = 0;
	vector <bool> used (n + 1, false);
	for (int i = 0; i < n; i++){
		if (!used[i]){
			ll cnt = 0;
			for (int j = i + 1; j < n; j++){
				if(!used[j]){
					cnt++;
				}
				if (!used[j] and s[i] == -s[j]){
					used[j] = true;
					break;
				}
			}
			cnt--;
			// cout << "cnt : " << cnt << "\n";
			ans += cnt;
			if (s[i] > 0){
				ans++;
			}
			used[i] = true;
		}
	}
	return ans;
}

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