打卡贴 目标每日四题 时间一个月

Day 18 Segment Tree

LintCode
201. Segment Tree Build
439. Segment Tree Build II
202. Segment Tree Query
247. Segment Tree Query II
203. Segment Tree Modify
261 / 400

Day 19 Segment Tree
307. Range Sum Query - Mutable
308. Range Sum Query 2D - Mutable
LintCode
248. Count of Smaller Number
205. Interval Minimum Number
265 / 400

Day 19 Inverse Pairs
315. Count of Smaller Numbers After Self
327. Count of Range Sum
493. Reverse Pairs
629. K Inverse Pairs Array
775. Global and Local Inversions
270 / 400

Day 21 Math
65. Valid Number
67. Add Binary
149. Max Points on a Line
202. Happy Number
273. Integer to English Words
246. Strobogrammatic Number
247. Strobogrammatic Number II
628. Maximum Product of Three Numbers
278 / 400

Day 21 Math
166. Fraction to Recurring Decimal
777. Swap Adjacent in LR String
670. Maximum Swap
281 / 400

Day 23 BST
98. Validate Binary Search Tree
108. Convert Sorted Array to Binary Search Tree
109. Convert Sorted List to Binary Search Tree
173. Binary Search Tree Iterator
450. Delete Node in a BST
700. Search in a Binary Search Tree
701. Insert into a Binary Search Tree
235. Lowest Common Ancestor of a Binary Search Tree
129. Sum Root to Leaf Numbers
1038. Binary Search Tree to Greater Sum Tree
291/400

BST 做完了 目前 298/400 最近效率好低QvQ

Day 25 Intervals
163. Missing Ranges
252. Meeting Rooms
253. Meeting Rooms II  
370. Range Addition
56. Merge Intervals
57. Insert Interval
986. Interval List Intersections

305/400

Day 25 Intervals

228. Summary Ranges
759. Employee Free Time
LintCode
577. Merge K Sorted Interval Lists

308/400

Day 26 String & Array
76. Minimum Window Substring
186. Reverse Words in a String II
557. Reverse Words in a String III
157. Read N Characters Given Read4
158. Read N Characters Given Read4 II - Call multiple times
316 / 400