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题目 Imagine you are building a compiler. Before running any code, the compiler must check that the parentheses in the program are balanced. Every openi
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posted @ 2019-10-08 02:40
Optimus_Prime
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题目 A palindrome is a sequence of characters that reads the same backwards and forwards. Given a string, s, find the longest palindromic substring in s
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posted @ 2019-10-08 02:34
Optimus_Prime
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题目 Given a string, find the length of the longest substring without repeating characters. 分析 任意2个重复的字符不可能同时存在于一个合法的子串中。因此，可以从左到右扫描字符，用一个字典记录出现过的字符。 一旦
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posted @ 2019-10-08 02:24
Optimus_Prime
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问题描述 You are given two linked lists representing two non negative integers. The digits are stored in reverse order and each of their nodes contain a s
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posted @ 2019-10-08 02:18
Optimus_Prime
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