Find Duplicates
You have an array with all the numbers from 1 to N, where N is at most 32,000.
#数组和字符串
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Palindrome Number
Determine whether an integer is a palindrome. Do this without extra space.
Check Palindrome
回文，英文palindrome，指一个顺着读和反过来读都一样的字符串，比如madam、我爱我，这样的短句在智力性、趣味性和艺术性上都颇有特色，中国历史上还有很多有趣的回文诗。
Palindrome Permutation
Given a string, write a function to check if it is a permutation of a palindrome.
Check Permutation
Given two strings, write a method to decide if one is a permutation of the other.