# DCP-497: Exactly Two Times Back to All Problems

Easy Beginners Problems > Implementation

You are given an array **A** with total **N** integer numbers ranging from **1** to **N-1**, where all elements from **1** to **N-1** appears exactly once but one element appears exactly twice. Your task is to find out that element which occur exactly two times. Input: ------ Input starts with an integer **T (1<=T<=20)**, denoting the number of test cases.<br> Each case contains an integer **N (2 ≤ N ≤ 10000)** denoting the number of elements of array **A**. The next line will contain **N** integers separated by spaces, denoting the elements of the array **A**. Each of these integers will be in the range from **1** to **N-1**. Output: ------- For each case of input, output the element which occurs exactly twice in the given array. Sample Input ------------ 1 5 1 2 4 3 1 Sample Output ------------- 1

### Problem Limits

 Language Time Limit (seconds) C 2.00 C++ 2.00 C++14 2.00 C# 2.00 Go 2.00 Java 2.00 JavaScript 2.00 Objective-C 2.00 Perl 2.00 PHP 2.00 Python 2.00 Python3 2.00 Ruby 2.00 VB.Net 2.00

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