K Sum Paths
Given a binary tree and an integer k, determine the number of downward-only paths where the sum of the node values in the path equals k. […]
1790. Check if One String Swap Can Make Strings Equal
You are given two strings s1 and s2 of equal length. A string swap is an operation where you choose two indices in a string (not
Diameter of a Binary Tree
Given a binary tree, the diameter (also known as the width) is defined as the number of edges on the longest path between two
1800. Maximum Ascending Subarray Sum
Given an array of positive integers nums, return the maximum possible sum of an ascending subarray in nums. A subarray is defined as a contiguous
Word Search
You are given a two-dimensional mat[][] of size n*m containing English alphabets and a string word. Check if the word exists on the mat. The word
3151. Special Array I
An array is considered special if every pair of its adjacent elements contains two numbers with different parity. You are given an
2493. Divide Nodes Into the Maximum Number of Groups
You are given a positive integer n representing the number of nodes in an undirected graph. The nodes are labeled from 1 to n. You are also
Implement Pow
Implement the function power(b, e), which calculates b raised to the power of e (i.e. be). Examples: Input: b = 3.00000, e = 5Output: 243.00000
684. Redundant Connection
In this problem, a tree is an undirected graph that is connected and has no cycles. You are given a graph that
2658. Maximum Number of Fish in a Grid
You are given a 0-indexed 2D matrix grid of size m x n, where (r, c) represents: A land cell if grid[r][c] = 0, or A water cell containing grid[r][c] fish, if grid[r][c] > 0.
Permutations of a String
Given a string s, which may contain duplicate characters, your task is to generate and return an array of all unique permutations of