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Leetcode 210: Course Schedule II

You are given a set of courses with prerequisites, and you need to find a valid order to take them, or return an empty array if no valid order exists.

Oct 17, 2024 - 7 min read

Leetcode 226: Invert Binary Tree

Given the root of a binary tree, invert the tree by swapping the left and right subtrees of every node, and return its root.

Oct 15, 2024 - 4 min read

Leetcode 279: Perfect Squares

Given an integer n, return the least number of perfect square numbers that sum to n. A perfect square is a number that is the square of an integer. Your goal is to determine the minimum number of perfect squares that sum up to the given integer n.

Oct 10, 2024 - 5 min read

Leetcode 310: Minimum Height Trees

You are given a tree with ’n’ nodes labeled from 0 to n-1, represented by ’n-1’ edges. Your task is to find all roots that minimize the height of the tree. The height of a tree is defined as the number of edges in the longest downward path from the root to any leaf.

Oct 7, 2024 - 7 min read

Leetcode 322: Coin Change

You are given a set of coins with different denominations and a target amount. Your task is to determine the fewest number of coins required to make the target amount. If it’s not possible, return -1.

Oct 5, 2024 - 7 min read

Leetcode 365: Water and Jug Problem

You are given two jugs with capacities x and y liters, and an infinite supply of water. You need to determine whether you can measure exactly target liters of water using the following operations: fill, empty, and pour water between the jugs.

Oct 1, 2024 - 5 min read