Submission #201264

#	Time	Username	Problem	Language	Result	Execution time	Memory
201264		khulegub	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	6 ms	376 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>

#define mp make_pair
#define pb push_back
#define xx first
#define yy second

using namespace std;

typedef long long i64;



i64 count_swaps(std::vector<int> s) {

	i64 ans = 0LL;
	int n = s.size();

	map<int, vector<int> > maap;

	for (int i = n - 1; i >= 0; i--){
		maap[s[i]].pb(i);
	}

	vector<bool> taken(n, 0);

	for (int i = 0; i < n; i++){
		if (!taken[i]){
			maap[s[i]].pop_back();
			
			int tmp = maap[s[i] * -1].back();
			maap[s[i] * -1].pop_back();
			taken[tmp] = 1;

			if (s[i] < 0){
				ans += tmp - i - 1;
			}
			else{
				ans += tmp - i;
			}
		}
	}

	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