위클리 챌린지 1주차

https://programmers.co.kr/learn/courses/30/lessons/82612

코딩테스트 연습 - 1주차

def solution(price, money, count):
    return 0 if (n := money - price * (1 + count) * count / 2) > 0 else -n

def solution(price, money, count):
    return 0 if (n := price * (1 + count) * count / 2 - money) < 0 else n

def solution(price, money, count):
    return max(price * (1 + count) * count / 2 - money, 0)

 

golang

func solution(price int, money int, count int) int64 {
	n := money - price*(count+1)*count/2
	if n >= 0 {
		return 0
	}
	return -int64(n)
}

 

Java

class Solution {
    public long solution(int price, int money, int count) {
        var leftMoney = (long) money;
        for (var i = 1; i <= count; i++)
            leftMoney -= price * i;
        return leftMoney < 0 ? -leftMoney : 0;
    }
}

실수 범위에 대한 문제입니다. 

class Solution {
    public long solution(int price, int money, int count) {
        var leftMoney = money - (long) price * (count + 1) * count / 2;
        return leftMoney < 0 ? -leftMoney : 0;
    }
}

(long)을 이용해 명시적인 형변환을 했습니다. 

class Solution {
    public long solution(int price, int money, int count) {
        return Math.max((long) price * (count + 1) * count / 2 - money, 0);
    }
}