for lc
最长问题 ：
code3 : 最长子串(hashet)
code5 : 最长回文子串
code14 : 最长公共前缀(0,index+1)
整数取反：
code7 :整数取反
code9 :整数取反看是否对称
字符和整数转换：
code12：整数转字符(two arr)
code13：字符转整数(hashmap)
多数之和：
code1:两数之和
code15:三数之和
code16:三个数最接近target之和
code18:四数之和
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
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