The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like thi…

  Given two integers n and k, return all possible combinations of k numbers out …

  You are a professional robber planning to rob houses along a street. Each house has a certain amount of…

  Given an integer array with even length, where different numbers in this array represent diff…

  Given an array A (index starts at 1) consisting of N integers: A1, A2, …, AN …

  Given a binary search tree and the lowest and highest boundaries as L and R, trim the tr…

题目： Given two numbers represented as strings, return multiplication of the numbers as a string. Note: The numb…

Given an array of integers, return indices of the two numbers such that they add up to a specific target. You …

  
Given
 an 
arbitrary
 ransom
 note
 string 
and 
another 
string 
containing 
letters from
 all 
the 
…

A peak element is an element that is greater than its neighbors.Given an input array nums, where nums[i] ≠ num…

Given two arrays, write a function to compute their intersection. Example: Given nums1 = [1, 2, 2, 1], nums2 =…

43. Multiply Strings 题目 Given two non-negative integers num1 and num2 represented as strings, return the produ…