171. Excel Sheet Column Number
Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, retur…
633. Sum of Square Numbers
Given a non-negative integer c, your task is to decide whether there’re two integers a and b s…
598. Range Addition II
Given an m * n matrix M initialized with all 0‘s and several update operations. Operations are…
326. Power of Three
Given an integer, write a function to determine if it is a power of three. Follow up: Could you do i…
475. Heaters
Winter is coming! Your first job during the contest is to design a standard heater with fixed warm r…
240. Search a 2D Matrix II
Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the follo…
74. Search a 2D Matrix
Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the follo…
367. Valid Perfect Square
Given a positive integer num, write a function which returns True if num is a perfect square else Fa…
374. Guess Number Higher or Lower
We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to gues…
278. First Bad Version
You are a product manager and currently leading a team to develop a new product. Unfortunately, the …