FindTheNumber.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

public class Solution {



    // Complete the findNumber function below.
    static String findNumber(List<Integer> arr, int k) {
        String answer = "NO";
        for (Integer i : arr) {
            if (i == k) {
                answer = "YES";
                break;
            }
        }
        return answer;
    }

    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int arrCount = Integer.parseInt(bufferedReader.readLine().trim());

        List<String> arrTemp = new ArrayList<>();

        IntStream.range(0, arrCount).forEach(i -> {
            try {
                arrTemp.add(bufferedReader.readLine().replaceAll("\\s+$", ""));
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        });

        List<Integer> arr = arrTemp.stream()
            .map(String::trim)
            .map(Integer::parseInt)
            .collect(toList());

        int k = Integer.parseInt(bufferedReader.readLine().trim());

        String res = findNumber(arr, k);

        bufferedWriter.write(res);
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}

FindTheNumberQuestion.txt

Given an unsorted array of n elements, find if the element k is present in the array or not.
Complete the findNumber function in the editor below. It has 2 parameters:
  1. An array of integers, arr, denoting the elements in the array.
  2. An integer, k, denoting the element to be searched in the array.
The function must return a string "YES" or "NO" denoting if the element is present in the array or not.

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Can you telle me the video to explain this programs

There is no video. This problem is from Hackerrank.com

Can you suggest me some coding questions to prepare ibm

Hackerrank.com, you can practice coding for interview in here: https://www.hackerrank.com/interview/interview-preparation-kit

Why does this solution work for all test cases presented by Hackerrank but the same solution using a for iteration loop fails for 5 out of 13 test cases?

` public static String findNumber(List arr, int k) {

    for (int i = 0; i < arr.size() ; i++) {
        if (i == k){
            return "YES";
        }
    }

    return "NO";
}`