LeetCode 刷题日志

We define the Perfect Number is a positive integer that is equal to the sum of all its positive divi…

Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in log…

Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, retur…

Given a non-negative integer c, your task is to decide whether there’re two integers a and b s…

Given an m * n matrix M initialized with all 0‘s and several update operations. Operations are…

Given an integer, write a function to determine if it is a power of three. Follow up:Could you do it…

Winter is coming! Your first job during the contest is to design a standard heater with fixed warm r…

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the follo…

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the follo…

Given a positive integer num, write a function which returns True if num is a perfect square else Fa…

We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to gues…

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

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…

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

Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), pro…