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Solved! Leetcode 63. Unique Paths II

Aug

13

2023

source: https://leetcode.com/problems/unique-paths-ii/ Unique Paths II Table of ContentsUnique Paths IIDescriptionExample 1:Example 2:Constraints:Solution Description You are given an m x n integer array grid. There is a robot initially located at the top-left corner (i.e., grid[0][0]). The robot tries to move to the bottom-right corner (i.e., grid[m – 1][n – 1]). The robot can only move ...

Solved! Leetcode 1557. Minimum Number of Vertices to Reach All Nodes

May

23

2023

source: https://leetcode.com/problems/minimum-number-of-vertices-to-reach-all-nodes/description/ Minimum Number of Vertices to Reach All Nodes Given a directed acyclic graph, with n vertices numbered from 0 to n-1, and an array edges where edges[i] = [fromi, toi] represents a directed edge from node fromi to node toi. Find the smallest set of vertices from which all nodes in the graph ...

Solved! Leetcode 101. Symmetric Tree

Mar

14

2023

source: https://leetcode.com/problems/symmetric-tree/description/ Symmetric Tree Given the root of a binary tree, check whether it is a mirror of itself (i.e., symmetric around its center). Example 1: Input: root = [1,2,2,3,4,4,3] Output: true Example 2: Input: root = [1,2,2,null,3,null,3] Output: false Constraints: The number of nodes in the tree is in the range [1, 1000]. -100 ...

Solved! Leetcode 72. Edit Distance

Feb

27

2023

source: https://leetcode.com/problems/edit-distance/ Edit Distance Given two strings word1 and word2, return the minimum number of operations required to convert word1 to word2. You have the following three operations permitted on a word: Insert a character Delete a character Replace a character Example 1: Input: word1 = “horse”, word2 = “ros” Output: 3 Explanation: horse -> ...

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Solved! Leetcode 63. Unique Paths II

Solved! Leetcode 1557. Minimum Number of Vertices to Reach All Nodes

Solved! Leetcode 101. Symmetric Tree

Solved! Leetcode 72. Edit Distance