Write a function that add two numbers A and B. You should not use + or any arithmetic operators.

Given an array nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k numbers in th...

Write an algorithm to determine if a number is “happy”.

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. Ad...

题目链接：http://codeforces.com/contest/1060/problem/A

Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly o...

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single...

Given a non-negative integer numRows, generate the first numRows of Pascal's triangle.

最近被算法虐了一下，刷一下leetcode，找找存在感如题：Given an array of integers, return indices of the two numbers such that they add up to a specific target.You may assume that ea......

public class Solution { public ListNode addTwoNumbers(ListNode l1, ListNode l2) { ListNode dummy = new ListNode(-1); ListNode cur = dummy; ...