linear_search.cpp

#include<iostream>
using namespace std;
int linearSearch(int arr[], int n, int key){
    for (int i = 0; i < n; i++){
        if (arr[i] == key){
            return i;
        }
    }
    return -1;
}
int main(){
    int n;
    cin>>n;
    int arr[n];
    for (int i = 0; i < n; i++){
        cin>>arr[i];
    }
    int key;
    cin>>key;
cout<<linearSearch(arr, n, key)<<endl;
    return 0;
}