Submission #808956

#	Time	Username	Problem	Language	Result	Execution time	Memory
808956		KemalK	Arranging Shoes (IOI19_shoes)	C++17	50 / 100	1093 ms	2144 KiB

shoes

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