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Binary Search

1970. Last Day Where You Can Still Cross

Disjoint Set

1970. Last Day Where You Can Still Cross

Backtracking

2305. Fair Distribution of Cookies

BFS

386. Lexicographical Numbers
2662. Minimum Cost of a Path With Special Roads(未完成)

Stack

946. Validate Stack Sequences

Hash Map

1. Two Sum

Recursion

87. Scramble String

Greedy

2601. Prime Subtraction Operation

Dynamic Programming

矩陣型

516.Longest Palindromic Subsequence
1639. Number of Ways to Form a Target String Given a Dictionary
2218. Maximum Value of K Coins From Piles
2684. Maximum Number of Moves in a Grid
2719. Count of Integers 2305. Fair Distribution of Cookies

樹型

2646. Minimize the Total Price of the Trips

bitmask

1799. Maximize Score After N Operations