Explore the Maximum Subarray problem with a brute-force triple loop, a quadratic improvement, and the optimal Kadane’s Algorithm, all with…
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Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may…
Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.…
Given two sorted arrays a[] and b[], where each array may contain duplicate elements , the task is to return the elements in the union of the two arrays…
Given an array, arr of n integers, and an integer element x, find whether element x is present in the array. Return the index of…
Given an integer array nums, move all 0’s to the end of it while maintaining the relative order of the non-zero elements.…
Learn a one-pass way to check if array is sorted in non-decreasing order. Intuition, commented Python code, dry run, and…
Need the second smallest and second largest in one array? We compare a clear two-pass “better” method with a one-pass…
Quick Sort is a popular sorting algorithm that follows a divide-and-conquer approach. When implemented well, Quick Sort can be extremely…
Merge Sort is a classic divide-and-conquer sorting technique. It divides the list into two halves, sorts each half recursively, and…