LeetCode: 987. Vertical Order Traversal of a Binary Tree
(Hard but Medium)
Sep 4, 20221 min read6
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Practices and solutions for typical algorithm problems
LeetCode: 417. Pacific Atlantic Water Flow (Medium)
Solutions For each grid (i, j), do BFS twice for both Pacific and Atlantic flow: O(n^4) For each grid (i, j), do BFS twice, but this time, can stop on grids already visited: slightly better For each grid (i, j) on each coastline, do BFS and return t...
Sep 1, 20222 min read6LeetCode: 994
Rotting Oranges (Medium)
Aug 26, 20222 min read24Leetcode: 567, 121, 121, 409, 589
3 Easy, 2 Medium
Aug 20, 20222 min read3Leetcode: 659
1 Medium
Aug 19, 20222 min read2Leetcode: 876, 142,344, 557
3 Easy, 1 Medium
Aug 18, 20221 min read19