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395. Longest Substring with At least K Repeating Characters Find the length of the longest substring T of a given string (consists of lowercase letter 阅读全文
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394. Decode String Given an encoded string, return it's decoded string. The encoding rule is: , where the encoded_string inside the square brackets is 阅读全文
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393. UTF 8 Validation A character in UTF8 can be from 1 to 4 bytes long, subjected to the following rules: 1. For 1 byte character, the first bit is a 阅读全文
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392. Is Subsequence Given a string s and a string t , check if s is subsequence of t . You may assume that there is only lower case English letters in 阅读全文