프로그래머스. 완주하지 못한 선수. Java and Python

1. java

import java.util.*;
class Solution {
    public String solution(String[] participant, String[] completion) {
        String answer = "";
        HashMap<String,Integer> hMap = new HashMap<String,Integer>();
        
        for(String c :completion){
            if(hMap.containsKey(c)){
                hMap.put(c, hMap.get(c)+1);
            }else{
                hMap.put(c, 1);
            }
        }
        
        for(String p : participant){
            if(hMap.containsKey(p)){
                int tm = hMap.get(p) - 1;
                if(tm == -1)    return p;
                else            hMap.put(p,tm);
            }else   return p;
        }
        
        return answer;
    }
}

 

2. python

def solution(participant, completion):
    answer = ''
    hDict = dict();
    for c in completion:
        if c in hDict:
            hDict[c] += 1
        else:
            hDict[c] = 1
            
    for p in participant:
        if p in hDict:
            hDict[p] -= 1
            if hDict[p] == -1: return p
        else:
            return p
        
    return answer