yanrui92的专栏

Given two binary strings, return their sum (also a binary string).For example,a = "11"b = "1"Return "100".public class Solution { public String addBinary(String a, String b) {

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a link

Given a positive integer, return its corresponding column title as appear in an Excel sheet.For example: 1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB /*what if

public boolean isPalindrome(int x) { if(x<0)return false; int y=0; int z=x; while(z>0){ int cur=z%10; y=y*10+cur; z=z/10; }