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0002. Add Two Numbers

0004. Median of Two Sorted Arrays

0012. Integer to Roman

0013. Roman to Integer

0015. 3Sum

0016. 3Sum Closest

0020. Valid Parentheses

0039. Combination Sum

0040. Combination Sum II

0050. Pow(x, n)

0057. Insert Interval

0069. Sqrt(x)

0133. Clone Graph

0146. LRU Cache

0171. Excel Sheet Column Number

0191. Number of 1 Bits

0216. Combination Sum III

0222. Count Complete Tree Nodes

0228. Summary Ranges

0307. Range Sum Query - Mutable

0313. Super Ugly Number

0338. Counting Bits

0343. Power of Four