Problem Statement Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place. Example 1: Input: [ [1,1,1], [1,0,1], [1,1,1] ] Output: [ [1,0,1], [0,0,0], [1,0,1] ] Solution We will use the first cell of every row and column . . . Read more

Problem Statment Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should preserve the original relative order of the nodes in each of the two partitions. Example Input: head = 1->4->3->2->5->2, x . . . Read more

Problem Statement Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Input: haystack = “hello”, needle = “ll” Output: 2 Solution

Problem Statement Given an array nums and a value val, remove all instances of that value in-place and return the new length. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. The order of elements can be . . . Read more

Problem StatementGiven a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. Given nums = [0,0,1,1,1,2,2,3,3,4], Your function . . . Read more

Problem Statement You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list. You may assume the two numbers do not contain any . . . Read more

Problem Statement Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. Example Given nums = [2, 7, 11, 15], . . . Read more

Step 1: create db user CREATE USER ‘blog_user’@’%’; GRANT ALL PRIVILEGES ON blog_db.* To ‘blog_user’@’%’ IDENTIFIED BY ‘s3cret’; To change it later you can use: SET PASSWORD FOR ‘blog_user’@’%’ = PASSWORD(‘xxxx’); Step 2: install WordPress Login into your AWS instance and run the following: $ cd /var/www/html $ wget http://wordpress.org/latest.tar.gz . . . Read more

Problem Statement Given arrays of different sizes, find the number of distinct triplets where is an element of , written as , , and , satisfying the criteria: and For example, given and we find four distinct triplets: $latex(3,6,4), (3,6,6), (5,6,4), (5,6,6)$ Function Description Complete the triplets function in the . . . Read more

Problem Statement Each time Sunny and Johnny take a trip to the Ice Cream Parlor, they pool their money to buy ice cream. On any given day, the parlor offers a line of flavors. Each flavor has a cost associated with it. Given the value of and the of each . . . Read more