Submission #723616

#	Time	Username	Problem	Language	Result	Execution time	Memory
723616		t6twotwo	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1 ms	300 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
long long count_swaps(vector<int> s) {
    map<int, queue<int>> mp;
    int64_t ans = 0;
    for (int i = 0; i < s.size(); i++) {
        if (!mp[-s[i]].empty()) {
            ans += i - mp[-s[i]].front();
            if (s[i] > 0) {
                ans--;
            }
            mp[-s[i]].pop();
        } else {
            mp[s[i]].push(i);
        }
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:7:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |     for (int i = 0; i < s.size(); i++) {
      |                     ~~^~~~~~~~~~

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