Duplicate in array

 #include <iostream>

using namespace std;

#include "solution.h"

int main()
{
int t;
cin >> t;
while (t--)
{
int size;
cin >> size;
int *input = new int[size];

for (int i = 0; i < size; i++)
{
cin >> input[i];
}

cout << findDuplicate(input, size) << endl;
}

return 0;
}



#include<bits/stdc++.h>
int findDuplicate(int *arr, int n)
{
//Write your code here
sort(arr,arr+n);
for(int i=0;i<n-1;i++){
if(arr[i]==arr[i+1]) return arr[i];
}
}

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