缺大米的请参加这个刷题/Mock interview活动

打卡 15 天

打开第6天

划分型dp和序列型 做了比较经典的3题

慕容清 发表于 2020/06/15 10:07:09
打卡第九天

Spiral matrix，这题比较有意思的一个点，是进行row和column的更新时，引入了一个顺时针的...

打卡第十天
复习了链表的一些题目的思路 就简单的刷了几道题

06.15 刷题第四天 打卡第四天

1. String replace

Mindset: choose one solution from "in-place" or using a "StringBuilder"

In order to achieve lower time complexity, I would rather choose "in-place"
but with the succinct of code.
a. Separate it into shorter and longer
b. use slow and fast pointer
c. Both needed to copied by using the target String
d. watch out for array index out of bound issue


2. Longest subString without repeating（Only need return the length of subString)

Mindset: use HashSet and three variables(slow, fast, longest);
Given a string, find the longest substring without any repeating characters and return the length of it. The input string is guaranteed to be not null.

3. longest subArray contains only 1s

Mindset：
use four variables
slow, fast, longest, count(to calculate how many flips we had used for now)

打个卡。。。。

day 13
3 道easy tree。。。虽然是easy。。比我昨天做的medium要难。。recursion根本没思路啊
还是要多多练习。。

06/15/2020 Day12
今天刷了3道题。

06/15 #184/185/196/197 第三天了 明天继续！

#184: where clause 可以用 （a,b）通过sub table 限定多个columns
#185 : leetcode的test 有点问题 不能很好的test 我的query 需要过一阵子回来看
#196：考察delete的用法 原来可以再delete里面用self join
#197： null

Day1:
https://www.***.org/find-closest-element-binary-search-tree/
https://leetcode.com/problems/insert-delete-getrandom-o1/
https://leetcode.com/problems/fraction-to-recurring-decimal/
https://leetcode.com/problems/powx-n

Day 15 三道题打卡……