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频率从高到底排序 , 大家加油, 争取十分钟一道题,bug Free. 都是很经典的题目
301
Remove Invalid Parentheses
40.5%
Hard
953
Verifying an Alien Dictionary
55.8%
Easy
273
Integer to English Words
25.0%
Hard
67
Add Binary
40.7%
Easy
238
Product of Array Except Self
56.8%
Medium
158
Read N Characters Given Read4 II - Call multiple times
28.2%
Hard
253
Meeting Rooms II
43.7%
Medium
973
K Closest Points to Origin
61.1%
Medium
297
Serialize and Deserialize Binary Tree
42.8%
Hard
560
Subarray Sum Equals K
42.9%
Medium
282
Expression Add Operators
33.7%
Hard
125
Valid Palindrome
32.5%
Easy
621
Task Scheduler
46.5%
Medium
680
Valid Palindrome II
35.0%
Easy
523
Continuous Subarray Sum
24.3%
Medium
269
Alien Dictionary
32.4%
Hard
785
Is Graph Bipartite?
44.8%
Medium
426
Convert Binary Searcatching
25.7%
Hard
319
Bulb Switcher
44.5%
Medium
632
Smallest Range Covering Elements from K Lists
49.2%
Hard
157
Read N Characters Given Read4
30.8%
Easy
43
Multiply Strings
31.7%
Medium
691
Stickers to Spell Word
39.6%
Hard
921
Minimum Add to Make Parentheses Valid
70.6%
Medium
34
Find First and Last Position of Element in Sorted Array
34.3%
Medium
489
Robot Room Cleaner
66.3%
Hard
1004
Max Consecutive Ones III
55.0%
Medium
143
Reorder List
32.5%
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