Submission #1307491

#	Time	Username	Problem	Language	Result	Execution time	Memory
1307491		hectormedrano	Arranging Shoes (IOI19_shoes)	C++20	10 / 100	1100 ms	75864 KiB

shoes

#include <cstdio>
#include <cassert>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll count_swaps(vector<int> s) {
    ll inv = 0;
    ll n = s.size();
    n = n/2;
    vector<pair<ll, ll>> a;
    vector<queue<ll>> q(n+1);
    vector<ll> v;
    for(ll i=0;i<2*n;i++){
        if(s[i]<0){
            a.push_back({s[i], i});
            a.push_back({-s[i], -1});
        } else {
            q[s[i]].push(i);
        }
        v.push_back(i);
    }
    for(ll i=0;i<2*n;i++){
        if(a[i].first > 0){
            a[i].second = q[a[i].first].front();
            q[a[i].first].pop();
        }
    }
    for(ll i=0;i<2*n;i++){
        ll j=2*n-1;
        while(v[j] != a[i].second){j--;}
        for(ll k=j;j>i;j--){
            swap(v[j], v[j-1]);
            inv++;
        }
    }
	return inv;
}

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