Competitive-Programming

This repository contains solved programming problems for building the skills of competitive programming.

Problem 1

Sort an array of 0’s 1’s 2’s without using extra space or sorting algorithm.

Problem 2

Given an sorted array of size n. Array elements are in the range from 1 to n. One number from the set {1,2,...,n} is missing and one occurs twice in the array. Find these two numbers.

Problem 3

Solve problem 2 with a same but "unsorted" array.