Submission #670505

#	Time	Username	Problem	Language	Result	Execution time	Memory
670505		birthdaycake	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1 ms	300 KiB

shoes

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

long long count_swaps(vector<int>s) {
    long long n = s.size(); long long ans = 0;
    map<long long,set<long long>>a;
    for(int i = 0; i < n; i++){
        a[s[i]].insert(-i);
    }
    for(int i = n - 1; i >= 0; i--){
        if(!a[s[i]].count(-i)) continue;
        a[s[i]].erase(-i);
        if(s[i] < 0){
            auto x = *a[-s[i]].begin();
            ans += (i - (-x));
            a[-s[i]].erase(x);
        }else{
            auto x = *a[-s[i]].begin();
            ans += (i - (-x) - 1);
            a[-s[i]].erase(x);
        }
    }
    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