Best Time to Buy and Sell Stock Question Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (i.e., buy one and sell one share of the stock)…

House Robber Question You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security s…

Maximum Subarray Question Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum. Example: Input: [-2,1,-3,4,-1,2,1,-5,4], Output: 6 Explanation: [4,-1,2,1] h…

Find k Pairs with Smallest Sums Question You are given two integer arrays nums1 and nums2 sorted in ascending order and an integer k. Define a pair (u,v) which consists of one element from the first array and one element from the second ar…

Subarray Sum Equals K Question Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals k. Example 1: Input:nums = [1,1,1], k = 2 Output: 2 Note: The length of the array is in …

Let's get started I read Shiroyama-san's blog post today and figured out it describes exactly what I think about the programming recently. Since I used to major in business and recently switched my major to computer science, I always feel …