A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down ...

A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Find all strobogrammatic numbers ...

Problem Description: A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function ...

Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive ...

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. ...

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 ...

Given a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time ...

描述：Determine whether an integer is a palindrome. Do this without extra space. Some hints: Could ...