Function linear

CPP/searching/linear_search.cpp:3–11

#include<bits/stdc++.h>
using namespace std;
int linear(int arr[], int key, int n){
    for (int i = 0; i < n; ++i)
    {
        if(arr[i]==key){
            return i;
        }
    }
    return -1;
}
void initial(){
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);