Submission #867426

#	Time	Username	Problem	Language	Result	Execution time	Memory
867426		cheat_when_I_was_young	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	0 ms	348 KiB

shoes

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

long long count_swaps(vector<int> s) {
    int n = (int)s.size() / 2;
    vector<vector<int>> l(n+1, vector<int>());
    vector<vector<int>> r(n+1, vector<int>());

    long long ans = 0;

    for (int i = 0; i < (int)s.size(); ++i) {
        if (s[i] < 0) {
            s[i] = -s[i];
            if (r[s[i]].size()) {
                ans += i - r[s[i]].back();
                r[s[i]].pop_back();
            } else
                l[s[i]].push_back(i);
        } else {
            if (l[s[i]].size()) {
                ans += i - l[s[i]].back() - 1;
                l[s[i]].pop_back();
            } else
                r[s[i]].push_back(i);
        }
    }

    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