链接:https://ac.nowcoder.com/acm/contest/338/L来源:牛客网 Consider digits strings with length n, how many different strings have the sum of digits are multiple of 4? 输入描述: There are several test cases end with EOF. For each test case, there is an integer in…
String本质上是一个char数组(jdk 9之后是byte数组),并且是一个声明为final的数组,并且String的不可变也是通过这种把数组声明为final来实现的 public final class String implements java.io.Serializable, Comparable<String>, CharSequence { /** The value is used for character storage. */ private final char va…