Submission #1311426

#	Time	Username	Problem	Language	Result	Execution time	Memory
1311426		aleksandre	Arranging Shoes (IOI19_shoes)	C++20	0 / 100	1 ms	400 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
long long count_swaps(std::vector<int> s) {
	int n = s.size();
	long long ans = 0;
	map<int, queue<int>> m;
	vector<int> fix(n);
	for (int i = 0; i < n; i++) {
		m[s[i]].push(i);
		fix[i] = 0;
	}
	for (int i = 0; i < n; i++) {
		int res = s[i];
		if (res > 0) res -= s[i]-s[i];
		else res += s[i]+s[i];
		for (int j = i+1; j < m[res].front(); j++) {
			if (fix[j] == 0) {
				ans++;
			}
		}
		fix[i] = 1;
		fix[m[res].front()] = 1;
		m[s[i]].pop();
		m[res].pop();
	}
	return ans;
}

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