[JAVA ] 백준 #2839- 설탕 배달

https://www.acmicpc.net/problem/2839

2839번: 설탕 배달

 

 

 

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        
         if (n % 5 == 0) { //5로 바로 떨어질 때
            System.out.println(n / 5);
            return;
        } else { //5로 나눴을때 나머지 1이상
            int count = n / 5;
            for (int i = count; i > 0; i--) {
                int temp = n - (i * 5);
                if (temp % 3 == 0) {
                    System.out.println(i + (temp / 3));
                    return;
                }
            }
        }
        if (n % 3 == 0) {
            System.out.println(n / 3);
        } else {
            System.out.println(-1);
        }
    }
}

 

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        sc.close();

        int count = n / 5;

        switch (n % 5) {
            case 0:
                System.out.println(count);
                break;
            case 1:
            case 3:
                System.out.println(count + 1);
                break;
            case 2:
                if (count < 2) {
                    System.out.println(-1);
                } else {
                    System.out.println(count + 2);
                }
                break;
            case 4:
                if (count < 1) {
                    System.out.println(-1);
                } else {
                    System.out.println(count + 2);
                }
                break;
        }

    }
}