Submission #201601

#	Time	Username	Problem	Language	Result	Execution time	Memory
201601		khulegub	Arranging Shoes (IOI19_shoes)	C++14	0 / 100	11 ms	9720 KiB

shoes

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

#define mp make_pair
#define pb push_back
#define xx first
#define yy second
#define ll(x) (x*2) + 1
#define rr(x) (x*2) + 2

using namespace std;

typedef long long i64;


int n;

bool taken[200010];

vector<int> maap_l[200010], maap_r[200010];

i64 count_swaps(std::vector<int> s) {

	i64 ans = 0LL;
	n = s.size();

	for (int i = n - 1; i >= 0; i--){
		if (s[i] < 0) maap_l[s[i] * -1].pb(i);
		else maap_r[s[i]].pb(i);
	}

	for (int i = 0; i < n; i++){
		if (!taken[i]){
			int tmp;
			if (s[i] < 0){
				tmp = maap_r[s[i] * -1].back();

				maap_r[s[i] * -1].pop_back();
				maap_l[s[i] * -1].pop_back();
			}
			else{
				tmp = maap_l[s[i]].back();

				maap_l[s[i]].pop_back();
				maap_r[s[i]].pop_back();
			}

			taken[tmp] = 1;

			if (s[i] < 0){
				ans += tmp - i - 1;
			}
			else{
				ans += tmp - i;
			}

			for (int j = i; j <= tmp; j++) if (taken[j]) ans--;
		}
	}

	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