组队复习算法+刷题

程序媛orZ 发表于 2019-8-7 13:15
打卡2:
Array 系列
215. Kth Largest Element in an Array

连续第二天啦 特别棒 加油加油👍

chenghsu0224 发表于 2019-8-8 10:52
8.8打卡
1. [15] Sum => a + b = -c turn into Two Sum problem
2. [252] meeting rooms => sort

欢迎欢迎 加油加油呀

打卡！
昨天 leetcode 15 312
今天 lintcode 657 612 544 104 40 4 134

白天上班，身体不舒服，几道简单题凑数。。。
easy:
  [504] Base 7
  [506] Relative Ranks
  [507] Perfect Number
  [509] Fibonacci Number
  [520] Detect Capital
  [521] Longest Uncommon Subsequence I
medium:
  [454] 4Sum II (Map, O(n^2))
  [456] 132 Pattern (stack)

hard:
  [460] LFU Cache (Design, 双向链表)

8.9打卡：
23. Merge k Sorted List => PriorityQueue
56. Merge Intervals => Sort by start time and merge
297. Serialize and Deserialize Binary Tree => in-order traversal and construct tree
76. Minimum Window Substring => map contains char with occurrence, count = 0 when a valid window is found
238. Product of Array Except Self => leftProduct and rightProduct in two passes
269. Alien Dictionary => topological sort

08/08 打卡 (Day 2)
Arraylist
[7] Reverse Number

今日：
lc 833  706  297
复习queue相关知识点

208.implement-trie-prefix-tree.java --> 终于学会了Trie
224.basic-calculator.java --> sign 1 / -1
647.palindromic-substrings.java --> 从中间向两边扩散
981.time-based-key-value-store.java --> 第一次知道TreeMap 有个floorKey

8/9打卡
Leetcode 437

8.9 晚上打卡
88. Merge Sorted Array => start from the end and do it in-place
31. Next permutation => find reflection point
215. Kth Largest Element in Array => quick select
986. Interval List Intersections => merge intervals, pick max start and min end