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Codity Test and results

1) A non-empty array A consisting of N integers is given. The array contains an odd number of elements, and each element of the array can be paired with another element that has the same value, except for one element that is left unpaired. For example, in array A such that:   A[0] = 9  A[1] = 3  A[2] = 9   A[3] = 3  A[4] = 9  A[5] = 7   A[6] = 9 the elements at indexes 0 and 2 have value 9, the elements at indexes 1 and 3 have value 3, the elements at indexes 4 and 6 have value 9, the element at index 5 has value 7 and is unpaired. Write a function: class Solution { public int solution(int[] A); } that, given an array A consisting of N integers fulfilling the above conditions, returns the value of the unpaired element. For example, given array A such that:   A[0] = 9  A[1] = 3  A[2] = 9 A[3] = 3  A[4] = 9  A[5] = 7   A[6] = 9     the function should return 7, as explained in the example above. Write an efficient algorithm for the following assumptions: N
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TTD - Test Driven Development for Java Programmers

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What is Test Driven Development? Test Driven Development (TDD)  is a programming practice that instructs developers to write new code only if an automated test has failed. This avoids duplication of code. Test-Driven Development starts with designing and developing tests for every small functionality of an application. In TDD approach, first, the test is developed which specifies and validates what the code will do. TDD means "Test Driven Development". The primary goal of TDD is to make the code clearer, simple and bug-free. In the normal Software Testing process, we first generate the code and then test. Tests might fail since tests are developed even before the development. In order to pass the test, the development team has to develop and refactors the code. Refactoring a code means changing some code without affecting its behavior. The simple concept of TDD is to write and correct the failed tests before writing new code (before development). This helps to avo
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