Oct 03, 2026 • Leetcode
Binary Tree Level Order Traversal II
Given the root of a binary tree, return the bottom-up level order traversal of its nodes' values. (i.e., from left to right, level by level from leaf to root).
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Oct 02, 2026 • Leetcode
Count Submatrices With All Ones
Given an m x n binary matrix mat, return the number of submatrices that have all ones.
Read more →Oct 01, 2026 • Leetcode
Minimum Cost Tree From Leaf Values
Given an array arr of positive integers, consider all binary trees such that:
Read more →Jul 10, 2026 • Leetcode
Bitwise ORs of Subarrays
Given an integer array arr, return the number of distinct bitwise ORs of all the non-empty subarrays of arr.
Read more →Jul 09, 2026 • Leetcode
Longest Uncommon Subsequence I
Given two strings a and b, return the length of the longest uncommon subsequence between a and b. If no such uncommon subsequence exists, return -1.
Read more →Jul 08, 2026 • Leetcode
Base 7
Given an integer num, return a string of its base 7 representation.
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