[프로그래머스 1] 실패율 (C/C++)

#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
 
bool cmp(pair<double, int> a, pair<double, int> b)
{
    if(a.first == b.first)
    {
        if(a.second < b.second)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    else if(a.first > b.first)
    {
        return true;
    }
    else
    {
        return false;
    }
}
 
vector<int> solution(int N, vector<int> stages) 
{
    vector<int> answer;
    vector<pair<double, int>> reserve;
    
    sort(stages.begin(), stages.end());
 
    for(int k = 1; k <= N; k++)
    {
        int playerCnt = 0;
        int failCnt = 0;
        
        for(int i = 0; i < stages.size(); i++)
        {
            if(stages[i] >= k)
            {
                playerCnt++;
            }
            
            if(stages[i] == k)
            {
                failCnt++;
            }
        }
        
        if(failCnt == 0)
        {
            reserve.push_back({0, k});   
        }
        else
        {
            reserve.push_back({(double)failCnt/playerCnt, k});   
        }
    }
    
    sort(reserve.begin(), reserve.end(), cmp);
    
    for(int i = 0; i < reserve.size(); i++)
    {
        answer.push_back(reserve[i].second);
        cout << reserve[i].first << endl;
    }
    
    return answer;
}