solution 1: 比较低效 //url:https://leetcode.com/problems/av…

solution 1: //url:https://leetcode.com/problems/trim-a-…

//url:https://leetcode.com/problems/reverse-words-in-a-…

//url:https://leetcode.com/problems/middle-of-the-linke…

//url:https://leetcode.com/problems/reverse-string/desc…

//url:https://leetcode.com/problems/binary-gap/descript…

//url:https://leetcode.com/problems/subdomain-visit-cou…

//url:https://leetcode.com/submissions/detail/165342274…

//url:https://leetcode.com/problems/next-greater-elemen…

//url:https://leetcode.com/problems/reshape-the-matrix/…