Intro to Tutorial Challenges – HackerRank Solution

In this post, we will solve Intro to Tutorial Challenges HackerRank Solution. This problem (Intro to Tutorial Challenges) is a part of HackerRank Problem Solving series.

Objective

About Tutorial Challenges
Many of the challenges on HackerRank are difficult and assume that you already know the relevant algorithms. These tutorial challenges are different. They break down algorithmic concepts into smaller challenges so that you can learn the algorithm by solving them. They are intended for those who already know some programming, however. You could be a student majoring in computer science, a self-taught programmer, or an experienced developer who wants an active algorithms review. Here’s a great place to learn by doing!

Task

Each challenge will describe a scenario and you will code a solution. As you progress through the challenges, you will learn some important concepts in algorithms. In each challenge, you will receive input on STDIN and you will need to print the correct output to STDOUT.

There may be time limits that will force you to make your code efficient. If you receive a “Terminated due to time out” message when you submit your solution, you’ll need to reconsider your method. If you want to test your code locally, each test case can be downloaded, inputs and expected results, using hackos. You earn hackos as you solve challenges, and you can spend them on these tests.

For many challenges, helper methods (like an array) will be provided for you to process the input into a useful format. You can use these methods to get started with your program, or you can write your own input methods if you want. Your code just needs to print the right output to each test case.

Sample Challenge
This is a simple challenge to get things started. Given a sorted array (arr) and a number (V), can you print the index location of V in the array?

Example

arr = [1, 2, 3]
V = 3

Return 2 for a zero-based index array.

If you are going to use the provided code for I/O, this next section is for you.

Function Description

Complete the introTutorial function in the editor below. It must return an integer representing the zero-based index of V.

introTutorial has the following parameter(s):

• int arr[n]: a sorted array of integers
• int V: an integer to search for

Returns

• int: the index of V in arr

The next section describes the input format. You can often skip it, if you are using included methods or code stubs.

Input Format

The first line contains an integer, V, a value to search for.
The next line contains an integer, n, the size of arr. The last line contains n space-separated integers, each a value of arr[i] where 0 <= i < n.

The next section describes the constraints and ranges of the input. You should check this section to know the range of the input.

Constraints

• 1 <= n <= 1000
• -1000 <= V <= 1000, V ∈ arr
• V will occur in arr exactly once.

Sample Input 0

STDIN           Function
-----           --------
4               V = 4
6               arr[] size n = 6 (not passed, see function description parameters)
1 4 5 7 9 12    arr = [1, 4, 5, 7, 9, 12]

Sample Output 0

1

Explanation 0

V = 4. The value 4 is the 2^nd element in the array. Its index is 1 since the array indices start from 0 (see array definition under Input Format).

Solution – Intro to Tutorial Challenges – HackerRank Solution

C++

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int v, n;
    cin >> v >> n;
    
    int arr[n] = {0};
    for (int i = 0; i < n; i++)
        cin >> arr[i];
    
    for (int i = 0; i < n; i++) {
        if (arr[i] == v) {
            cout << i << endl;
            return 0;
        } else {
            continue;
        }
    }
    
    return 0;
}

Python

import sys

def introTutorial(V, arr):
    return arr.index(V)

if __name__ == "__main__":
    V = int(input().strip())
    n = int(input().strip())
    arr = list(map(int, input().strip().split(' ')))
    result = introTutorial(V, arr)
    print(result)

Java

import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        
        Scanner input = new Scanner(System.in);
        int V = input.nextInt();
        int n = input.nextInt();
        
        for(int i = 0; i < n; i++)
        {
            if(input.nextInt() == V)
            {
                System.out.println(i);
                System.exit(0);
            }
        }
    }
}

Note: This problem (Intro to Tutorial Challenges) is generated by HackerRank but the solution is provided by CodingBroz. This tutorial is only for Educational and Learning purpose.