Aryan Pundir - LearnYard - Free Programming & DSA Blogs | Read, Code, Excel

Sign in Subscribe

Aryan Pundir

Count Negative Numbers in a Sorted Matrix Solution In C++/Java/Python/JS

Problem Description Given a m x n matrix grid which is sorted in non-increasing order both row-wise and column-wise, return the number of negative numbers in grid. Examples Input: grid = [[4,3,2,-1],[3,2,1,-1],[1,1,-1,-2],[-1,-1,-2,-3]] Output: 8 Explanation: There

Search a 2D Matrix Solution In C++/Java/Python/JS

Problem Description You are given an m x n integer matrix matrix with the following two properties: Each row is sorted in non-decreasing order. The first integer of each row is greater than the last integer of the previous row. Given an integer target, return true if target is in

Search a 2D Matrix II Solution In C++/Java/Python/JS

Problem Description Write an efficient algorithm that searches for a value target in an m x n integer matrix matrix. This matrix has the following properties: Integers in each row are sorted in ascending from left to right. Integers in each column are sorted in ascending from top to bottom.

Daily Temperatures Solution In C++/Java/Python/JS

Problem Description Given an array of integers temperatures represents the daily temperatures, return an array answer such that answer[i] is the number of days you have to wait after the ith day to get a warmer temperature. If there is no future day for which this is possible, keep

Number of Submatrices That Sum to Target Solution In C++/Java/Python/JS

Problem Description Given a matrix and a target, return the number of non-empty submatrices that sum to target. What is a Submatrix? A submatrix x1, y1, x2, y2 is the set of all cells matrix[x][y] with x1 <= x <= x2 and y1 <= y <= y2. Two

Count the Number of Beautiful Subarrays Solution In C++/Java/Python/JS

Problem Description You are given a 0-indexed integer array nums. In one operation, you can: Choose two different indices i and j such that 0 <= i, j < nums.length. Choose a non-negative integer k such that the kth bit (0-indexed) in the binary representation of nums[i] and

Number of Wonderful Substrings Solution In C++/Java/Python/JS

Problem Description A wonderful string is a string where at most one letter appears an odd number of times. For example, "ccjjc" and "abab" are wonderful, but "ab" is not. Given a string word that consists of the first ten lowercase English letters ('

Sum of Digit Differences of All Pairs Solution In C++/Java/Python/JS

Problem Description Given an array nums consisting of positive integers where all integers have the same number of digits. The digit difference between two integers is the count of different digits that are in the same position in the two integers. Return the sum of the digit differences between all