598. Range Addition II

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

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

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

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

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

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

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

278. First Bad Version

You are a product manager and currently leading a team to develop a new product. Unfortunately, the …

69. Sqrt(x)

69. Sqrt(x)

Implement int sqrt(int x). Compute and return the square root of x. 思路: 这道题不难,用binary search 1-x就行,有…

162. Find Peak Element

162. Find Peak Element

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

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