组队复习算法+刷题

打卡6:
String 系列
87        Scramble String       
179        Largest Number
38        Count and Say

8.15打卡：
426. Convert Binary Search Tree to Sorted Doubly Linked List  => in-order traversal + recursion + first and last to keep track of the leftmost node and previous node
721. Accounts Merge  => build a component using neighbor emails in each account. Emails in common connect 2 components together
825. Friends Of Appropriate Ages  => <ageA, countA> & <ageB, countB> : friend requests = countA * countB
523. Continuous Subarray Sum  => map<mod(sum % k), index> +  when sum1 % k == sum2 % k, sum2-sum1 = nk
304. Range Sum Query 2D - Immutable  => sum(ABCD) = sum(OD)-sum(OB)-sum(OC) + sum(OA)

08/14 打卡 (Day 5)
14. Longest Common Prefix
26. Remove Duplicates from Sorted Array

打卡7:
String:
316        Remove Duplicate Letters
168        Excel Sheet Column Title       
171        Excel Sheet Column Number

qugemingzi 发表于 2019-8-13 15:37
打卡6:

进度：

打卡7:

进度：
9.1.3 string builder
interview question 1.3 URLify
review quick sort


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打卡summary：
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大家继续加油👍👍

Day day up!

打卡
1. [468] Validate IP Address
2. [504] Base 7

补充内容 (2019-8-16 10:08):
3 470-Implement Rand10() Using Rand7()

8.15打卡：161. One Edit Distance  => 3 cases + judge len diff == 1 at last
317. Shortest Distance from All buildings   => BFS: for each building accumulate distance between it and every house
632. Smallest Range Covering Elements from K Lists  => Similar to Merge K Lists, keep track of current min range
1099. Two Sum Less Than K   => two pointers

一起一起 加个好友刷题

08/15 打卡 (Day 6)
[27] Remove Element - Easy
[709] To Lower Case - Easy   

8/15 继续DP
198.house-robber.java
276.paint-fence.java