Submission #589754

#	Time	Username	Problem	Language	Result	Execution time	Memory
589754		shrimb	Arranging Shoes (IOI19_shoes)	C++17	45 / 100	558 ms	291724 KiB

shoes

#include"bits/stdc++.h"
using namespace std;
#include "shoes.h"

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<class x>
using ordered_set = tree<x, null_type,less<x>, rb_tree_tag,tree_order_statistics_node_update>;

long long count_swaps(std::vector<int> s) {
	int n = s.size();

	int a[n];
	int b[n];

	queue<int> p[n + 1];
	queue<int> p2[n + 1];

	for (int i = 0 ; i < n ; i++) {
		if (s[i] > 0) p[s[i]].push(i);
		else p2[-s[i]].push(i);
	}
	int cnt = 0, cnt2 = 0;
	for (int i = 0 ; i < n ; i++) {
		if (s[i] < 0) {
			a[i] = cnt++;
			a[p[-s[i]].front()] = cnt++;
			p[-s[i]].pop();
		} else {
			b[i] = cnt2 + 1;
			b[p2[s[i]].front()] = cnt2;
			cnt2 += 2;
			p2[s[i]].pop();
		}
	}

	// for (int i = 0 ; i < n ; i++) cout << b[i] << " ";
	// cout << endl;

	long long ret = 0;
	long long ret2 = 0;
	ordered_set<int> os, os2;

	for (int i = 0 ; i < n ; i++) {
		ret += os.order_of_key(-a[i]);
		ret2 += os2.order_of_key(-b[i]);
		os.insert(-a[i]);
		os2.insert(-b[i]);
	}
	return min(ret, ret2);

}

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