LeetCode Solutions and Explanations
Here is a list of LeetCode problems solved by Goodtecher. Goodtecher will keep updating solutions and explains to LeetCode problems.…
LeetCode 1293. Shortest Path in a Grid with Obstacles Elimination
Description https://leetcode.com/problems/shortest-path-in-a-grid-with-obstacles-elimination/ You are given an m x n integer matrix grid where each cell is either 0 (empty) or 1 (obstacle). You can move up, down, left,…
LeetCode 1110. Delete Nodes And Return Forest
Description https://leetcode.com/problems/delete-nodes-and-return-forest/ Given the root of a binary tree, each node in the tree has a distinct value. After deleting all nodes…
LeetCode 1057. Campus Bikes
Description https://leetcode.com/problems/campus-bikes/ On a campus represented on the X-Y plane, there are n workers and m bikes, with n <= m. You are given an…
LeetCode 1059. All Paths from Source Lead to Destination
Description https://leetcode.com/problems/all-paths-from-source-lead-to-destination/ Given the edges of a directed graph where edges[i] = [ai, bi] indicates there is an edge between nodes ai and bi, and two nodes source and destination of…
LeetCode 475. Heaters
Description https://leetcode.com/problems/heaters/ Winter is coming! During the contest, your first job is to design a standard heater with a fixed…
LeetCode 216. Combination Sum III
Description https://leetcode.com/problems/combination-sum-iii/ Find all valid combinations of k numbers that sum up to n such that the following conditions are true: Only numbers 1 through 9 are used.…
LeetCode 264. Ugly Number II
Description https://leetcode.com/problems/ugly-number-ii/ An ugly number is a positive integer whose prime factors are limited to 2, 3, and 5. Given an integer n, return the nth ugly number. Example…
LeetCode 1631. Path With Minimum Effort
Description https://leetcode.com/problems/path-with-minimum-effort/ You are a hiker preparing for an upcoming hike. You are given heights, a 2D array of size rows x…
LeetCode 272. Closest Binary Search Tree Value II
Description https://leetcode.com/problems/closest-binary-search-tree-value-ii/ Given the root of a binary search tree, a target value, and an integer k, return the k values in the BST that are closest to…
LeetCode 1197. Minimum Knight Moves
Description https://leetcode.com/problems/minimum-knight-moves/ In an infinite chess board with coordinates from -infinity to +infinity, you have a knight at square [0, 0]. A knight has 8 possible moves it…