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1130 Minimum Cost Tree From Leaf Values 综合性比较高的一道题，记录一下，便于思考和回顾。 原题地址：Minimum Cost Tree From Leaf Values Given an array arr of positive integers, consider all binary trees such that: Each node has either 0 or 2 children; The values of arr correspond to t

题目：Given a string, find the length of the longest substring without repeating characters.Examples: Given “abcabcbb”, the answer is “abc”, which the length is 3. Given “bbbbb”, the answer is “b”, with t