题干：难度：MediumGiven n non-negative integers a1, a2, ..., an , where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (...
题干：难度：EasyDetermine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.Example 1:
题干：难度:MediumImplement atoi which converts a string to an integer.The function first discards as many whitespace characters as necessary until the first non-whitespace character is found. Then, star...
题干：难度：EasyGiven a 32-bit signed integer, reverse digits of an integer.Example 1:
Note:Assume we are deali...
题干：难度：MediumThe string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)
P A H N...