DFS

Leetcode 46 Permutations

by leetcode-solution.com
August 8, 2024

https://leetcode.com/problems/permutations/description This is problem is asking us to find all possible permutations, one common way to do it is through DFS. First of all let’s convert this problem into a search tree so it’s easier to reason. e,g [1, 2,… Read More »Leetcode 46 Permutations

Leetcode 671 Second Minimum Node In a Binary Tree

by leetcode-solution.com
June 2, 2024June 2, 2024

Problem Statement Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly two or zero sub-node. If the node has two sub-nodes, then this node’s value is the smaller value among its two… Read More »Leetcode 671 Second Minimum Node In a Binary Tree