LeetCode Topics

String

Problem Name	Difficulty
0008-string-to-integer-atoi	Medium
0012-integer-to-roman	Medium
0013-roman-to-integer	Easy
0014-longest-common-prefix	Easy
0020-valid-parentheses	Easy

Array

Problem Name	Difficulty
0001-two-sum	Easy
0011-container-with-most-water	Medium
0014-longest-common-prefix	Easy
0015-3sum	Medium
0016-3sum-closest	Medium

Hash Table

Problem Name	Difficulty
0001-two-sum	Easy
0012-integer-to-roman	Medium
0013-roman-to-integer	Easy

Linked List

Problem Name	Difficulty
0002-add-two-numbers	Medium
0019-remove-nth-node-from-end-of-list	Medium
0021-merge-two-sorted-lists	Easy
0024-swap-nodes-in-pairs	Medium

Math

Problem Name	Difficulty
0002-add-two-numbers	Medium
0007-reverse-integer	Medium
0009-palindrome-number	Easy
0012-integer-to-roman	Medium
0013-roman-to-integer	Easy

Recursion

Problem Name	Difficulty
0002-add-two-numbers	Medium
0021-merge-two-sorted-lists	Easy
0024-swap-nodes-in-pairs	Medium

Two Pointers

Problem Name	Difficulty
0011-container-with-most-water	Medium
0015-3sum	Medium
0016-3sum-closest	Medium
0019-remove-nth-node-from-end-of-list	Medium

Greedy

Problem Name	Difficulty
0011-container-with-most-water	Medium

Trie

Problem Name	Difficulty
0014-longest-common-prefix	Easy

Sorting

Problem Name	Difficulty
0015-3sum	Medium
0016-3sum-closest	Medium

Stack

Problem Name	Difficulty
0020-valid-parentheses	Easy