摘要： 题目：Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may as... 阅读全文

摘要： 题目：Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.For example:Given num = 38, the process is like... 阅读全文

摘要： 题目：Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n.For example, given n = 1... 阅读全文

摘要： 题目：Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure y... 阅读全文

摘要： 题目：You are given an integer array nums and you have to return a new counts array. The counts array has the property where counts[i] is the number of s... 阅读全文

摘要： 题目：Watson给了Sherlock两个整数A和_B_，现在Watson问Sherlock他是否可以计算A和_B_之间（包含A和 B）的完全平方数的个数。完全平方数指的是任何整数的平方。例如，1， 4， 9， 16是完全平方数，因为它们分别是1， 2， 3，4的平方。输入格式 第一行包含一个整数T... 阅读全文

摘要： 题目：Write a program to find the nth super ugly number.Super ugly numbers are positive numbers whose all prime factors are in the given prime list prime... 阅读全文

摘要： 题目：Write a program to find the n-th ugly number.Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 1, 2, 3, 4, 5... 阅读全文

摘要： 题目：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. For e... 阅读全文

摘要： 题目：Given n balloons, indexed from 0 to n-1. Each balloon is painted with a number on it represented by array nums. You are asked to burst all the ball... 阅读全文