洛谷P1634、P1888、P3954、P5660题解（Java语言描述）

P1634题目要求

P1634题目链接

P1634题解

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        long sum = 1L;
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt(), b = scan.nextInt();
        scan.close();
        if (a > 0) {
            if (b > 0) {
                for (int i = 0; i = y && x >= z) {
            maxNumber = x;
            if (y >= z)
                minNumber = z;
            else
                minNumber = y;
        } else if (y >= x && y >= z) {
            maxNumber = y;
            if (x >= z)
                minNumber = z;
            else
                minNumber = x;
        } else {
            maxNumber = z;
            if (x >= y)
                minNumber = y;
            else
                minNumber = x;
        }

        int number1 = maxNumber;
        int number2 = minNumber;

        while(number2!=0){
            int r = number1 % number2;
            number1 = number2;
            number2 = r;
        }

        //在while过程中，a与b的值会发生改变，所以需要将a，b的值赋给oa,ob
        //oa与ob的最大公约数是a
        a = number1;
        minNumber /= a;
        maxNumber /= a;

        System.out.println(minNumber + "/" + maxNumber);
        scan.close();
    }

}

P3954题目要求

P3954题目链接

P3954题解

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int x = scan.nextInt(), y = scan.nextInt(), z = scan.nextInt();
        int result = (int)(x*0.2 + y*0.3 + z*0.5);
        System.out.println(result);
        scan.close();
    }

}

P5660题目要求

P5660题目链接

P5660题解

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String line = scanner.nextLine();
        scanner.close();
        char[] arr = line.toCharArray();
        int counter = 0;
        for (char c : arr) {
            if (c == 49) {
                counter++;
            }
        }
        System.out.println(counter);
    }
}

都是以前写的，如果lj，还请见谅