Intro

This compilation contains several frequently-asked algorithms in interviews and its related LeetCode questions. This is like a note other than a complete and thorough instruction to follow. I recorded LeetCode questions that I’ve done and categorized them which may help you and myself as well to find questions in specific fields in a convenient way.

Fields

• DFS/Backtracking
• Tree
• BFS
• Double Pointers
• Sliding Window
• Bisection
• Stack
• Heap
• Union
• Topology
• Dynamic Programming
• Dijkstra

DFS/Backtracking

Problem	Difficulty	Solution
LeetCode 46	Med	See My Solution
LeetCode 78	Med	See My Solution
LeetCode 39	Med	See My Solution
LeetCode 79	Med	See My Solution
LeetCode 22	Med	See My Solution

Tree

Problem	Difficulty	My Solution
LeetCode 104	Easy	See My Solution
LeetCode 110	Easy	See My Solution
LeetCode 236	Med	See My Solution
LeetCode 543	Easy	See My Solution
LeetCode 98	Med	See My Solution

BFS

Problem	Difficulty	My Solution
LeetCode 102	Med	See My Solution
LeetCode 200	Med	See My Solution
LeetCode 994	Med	See My Solution
LeetCode 127	Hard	See My Solution

Double Pointer

Problem	Difficulty	My Solution
LeetCode 167	Med	See My Solution
LeetCode 15	Med	See My Solution
LeetCode 11	Med	See My Solution
LeetCode 141	Easy	See My Solution

Sliding Window

Problem	Difficulty	My Solution
LeetCode 3	Med	See My Solution
LeetCode 76	Hard	See My Solution
LeetCode 209	Med	See My Solution
LeetCode 424	Med	See My Solution

Bisection

Problem	Difficulty	My Solution
LeetCode 704	Easy	See My Solution
LeetCode 34	Med	See My Solution
LeetCode 153	Med	See My Solution
LeetCode 875	Med	See My Solution

Stack

Problem	Difficulty	My Solution
LeetCode 739	Med	See My Solution
LeetCode 84	Hard	See My Solution
LeetCode 496	Easy	See My Solution

Heap

Problem	Difficulty	My Solution
LeetCode 215	Med
LeetCode 347	Med
LeetCode 23	Hard
LeetCode 295	Hard

Union

Problem	Difficulty	My Solution
LeetCode 547	Med
LeetCode 684	Med
LeetCode 721	Med

Topology

Problem	Difficulty	My Solution
LeetCode 207	Med
LeetCode 210	Med

Dynamic Programming

Problem	Difficulty	My Solution
LeetCode 70	Easy
LeetCode 198	Med
LeetCode 322	Med
LeetCode 300	Med
LeetCode 1143	Med
LeetCode 416	Med

Dijkstra

Problem	Difficulty	My Solution
LeetCode 3650	Med	See My Solution
LeetCode 743	Med	See My Solution
LeetCode 1631	Med	See My Solution

Materials

• LeetCode Problems