Submission #844031

#	Time	Username	Problem	Language	Result	Execution time	Memory
844031		Mr_Husanboy	Arranging Shoes (IOI19_shoes)	C++17	45 / 100	44 ms	14992 KiB

shoes

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

using namespace std;

template <typename T>
int len(T &a){return a.size();}

#define ll long long
long long count_swaps(vector<int> s){
	int n = len(s) / 2;
	vector<vector<vector<int>>> g(2, vector<vector<int>> (n + 1));
	for(int i = 2 * n - 1; i >= 0; i --){
		g[s[i]<0][abs(s[i])].push_back(i);
	}

	vector<int> done(2 * n);


	ll ans = 0;
	int cur = 0;

	for(int i = 0; i < 2 * n; i ++){
		if(done[i]){
			cur --; continue;
		}
		g[s[i] < 0][abs(s[i])].pop_back();
		ans += g[s[i] > 0][abs(s[i])].back() - i + (s[i] > 0) - 1 - cur;
		cur ++;
		done[g[s[i] > 0][abs(s[i])].back()] = 1;
		g[s[i] > 0][abs(s[i])].pop_back();
	}
	return ans;
}

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