In this project we tried to apply the things that I learned in Data Structures course the program consist of data Structures Doubly Skip list, Singly Linked list. Sorting Algorithms Selection Sort, Radix Sort, In this project we tried to match the valid trios of city, state, Country on the basis of CSVs files we were given in the start of project. The files contain all the Valid trios in Form of Id our task was to match the valid IDs and Ans that if that if given trio was valid or not.This whole project was made on C++