Submission #1012958

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012958		HappyCapybara	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	0 ms	348 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
#define ll long long

ll count_swaps(vector<int> s){
	int n = s.size()/2;
	map<int,queue<int>> m;
	for (int i=0; i<2*n; i++) m[s[i]].push(i);
	int res = 0;
	int x = 0;
	vector<bool> done(2*n, false);
	for (int i=0; i<2*n; i++){
		if (done[i]){
			x--;
			continue;
		}
		int j = m[-s[i]].front();
		m[-s[i]].pop();
		res += j-i;
		if (s[i] < 0) res--;
		done[i] = true;
		done[j] = true;
		x++;
	}
	return res;
}

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