import java.util.*; public class Main{     public static void main(String[] args){         Scanner sc = new Scanner(System.in);         while(sc....

import java.util.*;  public class Main{     public static void main(String[] args){         Scanner sc = new Scanner(System.in);         int N = sc.nextInt();         sc.close();              &nb...

            double delta = b * b - (4 * a * c);              if(delta == 0){                 double x = -b / (2 * a);                 System...

import java.util.*;  public class Main{     public static void main(String[] args){         Scanner sc = new Scanner(System.in);         while(sc.hasNext()){             System.out.println(         &n...

        //write your code here......         //如果start比end大，则交换         if(start > end){             start = start + end - (end = start);         }     ...

        //总字符个数         int totalLen = str.length();         //英文字母个数         words = totalLen - str.replaceAll("[a-zA-Z]", "").length();         //数字个数         numbers = totalLen ...