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 …
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…