There is a collection of input strings and a collection of query strings. For each query string, determine how many times it occurs in the list of input strings. https://www.hackerrank.com/challenges/sparse-arrays/problem
Complete the function isBalanced in the editor below. It must return a string: YES if the sequence is balanced or NO if it is not. isBalanced has the following parameter(s): s: a string of brackets
https://www.hackerrank.com/challenges/balanced-brackets/problem
In this challenge, you must implement a simple text editor. Initially, your editor contains an empty string, . You must perform operations of the following types: append delete print undo
https://www.hackerrank.com/challenges/simple-text-editor/problem
kyline Real Estate Developers is planning to demolish a number of old, unoccupied buildings and construct a shopping mall in their place. Your task is to find the largest solid area in which the mall can be constructed. https://www.hackerrank.com/challenges/largest-rectangle/problem
Starting with a 1-indexed array of zeros and a list of operations, for each operation add a value to each of the array element between two given indices, inclusive. Once all operations have been performed, return the maximum value in your array. https://www.hackerrank.com/challenges/crush/problem
Minimum Average Waiting Time (Careful the inputs are not ordered by arrival time, it seems so but isn't)
Tieu owns a pizza restaurant and he manages it in his own way. While in a normal restaurant, a customer is served by following the first-come, first-served rule, Tieu simply minimizes the average waiting time of his customers. So he gets to decide who is served first, regardless of how sooner or later a person comes. https://www.hackerrank.com/challenges/minimum-average-waiting-time/problem