序：

　　用于记录刷题过程中难度较大或思路怪异的题目，对于常规难度一般的题就不写入我的博客了，关于效率仅是提交时击败的百分比，可能会随时间波动，仅供参考，算法优劣以时间复杂度和空间复杂度为基准。欢迎留言讨论。

题目序号

难度

效率

Leetcode 42. Trapping Rain Water

Hard

100.00%

Leetcode 57. Insert Interval

Hard

96.62%

Leetcode 84. Largest Rectangle in Histogram

Hard

99.36%

Leetcode 140. Word Break II

Hard

100.00%

Leetcode 146. LRU Cache

Hard

41.09%

Leetcode 188. Best Time to Buy and Sell Stock IV

Hard

95.75%

Leetcode 212. Word Search II

Hard

95.94%

Leetcode 224. Basic Calculator

Hard

98.05%

Leetcode 269. Alien Dictionary

Hard

100.00%

Leetcode 295. Find Median from Data Stream

Hard

93.94%

Leetcode 305. Number of Islands II

Hard

92.60%

Leetcode 312. Burst Balloons

Hard

38.90%

Leetcode 315. Count of Smaller Numbers After Self

Hard

97.93%

Leetcode 316. Remove Duplicate Letters

Hard

68.87%

Leetcode 354. Russian Doll Envelopes

Hard

100.00%

Leetcode 358. Rearrange String k Distance Apart

Hard

92.00%

Leetcode 399. Evaluate Division

Medium

100.00%

Leetcode 403. Frog Jump

Hard

93.02%

Leetcode 410. Split Array Largest Sum

Hard

100.00%

Leetcode 425. Word Squares

Hard

30.45%

Leetcode 465. Optimal Account Balancing

Hard

38.43%

Leetcode 480. Sliding Window Median

Hard

19.86%

Leetcode 493. Reverse Pairs

Hard

27.52%

Leetcode 527. Word Abbreviation

Hard

66.67%

Leetcode 552. Student Attendance Record II

Hard

83.12%

Leetcode 568. Maximum Vacation Days

Hard

46.07%

Leetcode 642. Design Search Autocomplete System

Hard

98.00%

Leetcode 668. Kth Smallest Number in Multiplication Table

Hard

36.19%

Leetcode 683. K Empty Slots

Hard

97.77%

Leetcode 685. Redundant Connection II

Hard

41.58%

Leetcode 689. Maximum Sum of 3 Non-Overlapping Subarrays

Hard

52.81%

Leetcode 715. Range Module

Hard

53.06%

Leetcode 719. Find K-th Smallest Pair Distance

Hard

64.17%

Leetcode 727. Minimum Window Subsequence

Hard

62.68%

Leetcode 745. Prefix and Suffix Search

Hard

66.67%

Leetcode 753. Cracking the Safe

Hard

65.22%

Leetcode 759. Employee Free Time

Hard

100.00%

Leetcode 765. Couples Holding Hands

Hard

100.00%

Leetcode 773. Sliding Puzzle

Hard

100.00%

Leetcode 774. Minimize Max Distance to Gas Station

Hard

82.47%

Leetcode 778. Swim in Rising Water

Hard

53.08%

Leetcode 793. Preimage Size of Factorial Zeroes Function

Hard

100.00%

Leetcode 798. Smallest Rotation with Highest Score

Hard

100.00%

Leetcode 803. Bricks Falling When Hit

Hard

88.00%

Leetcode 815. Bus Routes

Hard

75.47%

Leetcode 827. Making A Large Island

Hard

98.93%

Leetcode 843. Guess the Word

Hard

100.00%

Leetcode 855. Exam Room

Medium

93.83%

Leetcode 887. Super Egg Drop

Hard

51.58%

Leetcode 915. Partition Array into Disjoint Intervals

Medium

44.95%

Leetcode 920. Number of Music Playlists

Hard

76.03%

Leetcode 940. Distinct Subsequences II

Hard

41.27%

Leetcode 955. Delete Columns to Make Sorted II

Medium

100.00%

Leetcode 961. N-Repeated Element in Size 2N Array

Easy

99.23%