Day 05 - 코딩테스트 입문(Java)

1. 옷가게 할인 받기

https://school.programmers.co.kr/learn/courses/30/lessons/120818

프로그래머스

class Solution {
    public int solution(int price) {
        int answer = 0;
        
        if(price >= 500000) {
            answer = (int) (price * 0.8);
        } else if(price >= 300000) {
            answer = (int) (price * 0.9);
        } else if(price >= 100000) {
            answer = (int) (price * 0.95);
        } else {
            answer = price;
        }
        
        return answer;
    }
}

 

2. 아이스 아메리카노

https://school.programmers.co.kr/learn/courses/30/lessons/120819

프로그래머스

▼ 방법 1

class Solution {
    public int[] solution(int money) {
        int[] answer = new int[2];
        
        answer[0] = money / 5500;
        answer[1] = money % 5500;
        
        return answer;
    }
}

 

▼ 방법 2

class Solution {
    public int[] solution(int money) {
        int[] answer = {money / 5500, money % 5500};
        
        return answer;
    }
}

 

3. 나이 출력

https://school.programmers.co.kr/learn/courses/30/lessons/120820

프로그래머스

class Solution {
    public int solution(int age) {
        int answer = 0;
        
        answer = 2022 - age + 1;
        
        return answer;
    }
}

 

4. 배열 뒤집기

https://school.programmers.co.kr/learn/courses/30/lessons/120821

프로그래머스

▼ 방법 1

class Solution {
    public int[] solution(int[] num_list) {
        int[] answer = new int[num_list.length];
        
        for(int i = 0; i < num_list.length; i++) {
            answer[i] = num_list[num_list.length - 1 - i];
        }
        
        return answer;
    }
}

 

▼ 방법 2

import java.util.stream.IntStream;

class Solution {
    public int[] solution(int[] num_list) {
        int[] answer = {};
        
        answer = IntStream.range(0, num_list.length).map(i -> num_list[num_list.length - 1 - i]).toArray();
        
        return answer;
    }
}