Submission #1141136

#	Time	Username	Problem	Language	Result	Execution time	Memory
1141136		altern23	Arranging Shoes (IOI19_shoes)	C++20	10 / 100	0 ms	328 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long

long long count_swaps(vector<int> s) {
	ll n = s.size();
	vector<pair<ll, ll>> isi[n + 5];
	for(int i = 0; i < n; i++){
		isi[abs(s[i])].push_back({i, s[i]});
	}	
	ll ans = 0;
	for(ll i = 1; i <= n; i++){
		stack<ll> pos, neg;
		for(auto [idx, val] : isi[i]){
			// kalau - ketemu +
			if(val < 0){
				if(!pos.empty()){
					ans += idx - pos.top();
					pos.pop();
				}
				else{
					neg.push(idx);
				}
			}
			else{
				if(!neg.empty()){
					ans += idx - neg.top() - 1;
					neg.pop();
				}
				else{
					pos.push(idx);
				}
			}
		}
	}

	return ans;
}

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