摘要： Write a program to check whether a given number is an ugly number.Ugly numbers are positive numbers whose prime factors only include 2, 3, 5.... 阅读全文

摘要： Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight).For example, the... 阅读全文

摘要： Find the number of paths that sum to a given value.The path does not need to start or end at the root or a leaf, but it must go downwards (tr... 阅读全文

摘要： Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array [-2,1,-3... 阅读全文

摘要： Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inser... 阅读全文