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lc 242 Valid Anagram [242 Valid Anagram][1] Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = "anagra 阅读全文
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lc 231 Power of Two [231 Power of Two][1] Given an integer, write a function to determine if it is a power of two. analysation Easy problem. solution 阅读全文
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lc 191 Number of 1 Bits [191 Number of 1 Bits][1] Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also know 阅读全文