档案日期2016的33

LeetCode热身赛是LeetCode举办的第一场比赛，共3道题目，比赛时长24小时。

比赛链接：https://leetcode.com/contest/warm-up-contest/

题解列表：

LeetCode 386. Lexicographical Numbers

LeetCode 387. First Unique Character in a String

LeetCode 388. Longest Absolute File Path

题目描述：

LeetCode 388. Longest Absolute File Path

Suppose we abstract our file system by a string in the following manner:

The string "dir\n\tsubdir1\n\tsubdir2\n\t\tfile.ext" represents:

dir
    subdir1
    subdir2
        file.ext

The directory dir ...

题目描述：

LeetCode 387. First Unique Character in a String

Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1.

Examples:

s = "leetcode"
return 0.

s = "loveleetcode",
return 2.

Note: You ...

题目描述：

LeetCode 386. Lexicographical Numbers

Given an integer n, return 1 - n in lexicographical order.

For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9].

Please optimize your algorithm to use less ...

题目描述：

LeetCode 100. Same Tree

Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

题目大意：

给定两棵二叉树 ...