Submission #1030733

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030733		fv3	Arranging Shoes (IOI19_shoes)	C++14	45 / 100	31 ms	2808 KiB

shoes

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

using namespace std;
typedef long long ll;


ll count_swaps(vector<int> s) 
{
	const ll N = s.size() / 2;

	vector<int> l(N), r(N);
	int lc = 0;
	int rc = 0;

	for (int i = 0; i < 2*N; i++)
	{
		if (s[i] < 0)
			l[lc++] = i;
		else
			r[rc++] = i;
	}

	ll res = 0; int pos = 0;
	for (int i = 0; i < N; i++)
	{
		if (l[i] > pos) 
			res += l[i] - pos;
		pos += 2;
	}

	pos = 1;
	for (int i = 0; i < N; i++)
	{
		if (r[i] > pos)
			res += r[i] - pos;
		pos += 2;
	}

	return res;
}

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