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16 hours ago · 题目： Given a range [m, n] where 0 < m < n < 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 7], you should return 4.
16 hours ago · Consider the palindromes of odd vs even length. What difference do you notice? Count the frequency of each character. If each character occurs even number of times, then it must be a palindrome. How about character which occurs odd number of times? 题解： HashMap，奇数个的character的种类不能超过1. C++版：
16 hours ago · 题目： Given a string, determine if a permutation of the string could form a palindrome. For example, "code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even lengt…
16 hours ago · 题目： Given a string, determine if a permutation of the string could form a palindrome. For example, "code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even lengt…
16 hours ago · 题目： Given a string, determine if a permutation of the string could form a palindrome. For example, "code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even lengt…
