HackerRank Find a Word Solution

Hello Programmers, In this post, you will learn how to solve HackerRank Find a Word Solution. This problem is a part of the Regex HackerRank Series.

One more thing to add, don’t straight away look for the solutions, first try to solve the problems by yourself. If you find any difficulty after trying several times, then look for the solutions. We are going to solve the  Regex HackerRank Solutions using  CPP, JAVA, PYTHON, JavaScript & PHP Programming Languages.

You can practice and submit all HackerRank problem solutions in one place. Find a solution for other domains and Sub-domain. I.e. Hacker Rank solution for HackerRank C ProgrammingHackerRank C++ ProgrammingHackerRank Java Programming, HackerRank Python ProgrammingHackerRank Linux ShellHackerRank SQL Programming, and HackerRank 10 days of Javascript.

HackerRank Find a Word Solution
HackerRank Find a Word Solution

As you already know that this site does not contain only the Hacker Rank solutions here, you can also find the solution for other problems. I.e. Web Technology, Data StructuresRDBMS ProgramsJava Programs Solutions,  Fiverr Skills Test answersGoogle Course AnswersLinkedin Assessment, and Coursera Quiz Answers.

HackerRank Find a Word Solution


We define a word as a non-empty maximum sequence of characters that can contain only lowercase letters, uppercase letters, digits and underscores ‘_’ (ASCII value 95). Maximum sequence means that the word has to be immediately preceeded by a character not allowed to occur in a word or by the left boundary of the sentence, and it has to be immediately followed by a character not allowed to occur in a word or by the right boundary of the sentence.

Given N sentences and T words, for each of these words, find the number of its occurences in all the N sentences.

Input Format

In the first line there is a single integer N. Each of the next N lines contains a single sentence. After that, in the next line, there is a single integer T denoting the number of words. In the i-th of the next T lines, there is a single word denoting the i-th word for which, you have to find the number of its occurences in the sentences.


  • 1 <= N <= 100
  • 1 <= T <= 10

For every word, print the number of occurrences of the word in all the N sentences listed.

Sample Input

foo bar (foo) bar foo-bar foo_bar foo’bar barfoo bar, foo.

Sample Output



  • foo is the first word
  • (foo) is preceeded by ‘(‘ and followed by ‘)’, so it’s the second word.
  • foo-bar is considered as two words and ‘foo’ is the first of them. It is preceeded by a space and followed by a hyphen ‘-‘
  • bar-foo also contains foo for the same reason mentioned above
  • foo_bar is a single single word and hence foo in it is not counted
  • foo’bar is considered as two words and ‘foo’ is the first of them. It is preceeded by a space and followed by a apostrophe “‘”
  • foo. as it is preceeded by a space and followed by a dot’.

HackerRank Find a Word Solution in Cpp

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

bool chK(char ch)
    if(ch>='a' && ch<='z')
        return true;
    if(ch>='A' && ch<='Z')
        return true;
    if(ch>='0' && ch<='9')
        return true;
        return true;
    return false;

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int i,j,k,num,test;
    map<string,int> list;
    string str,in;
    return 0;

HackerRank Find a Word Solution in Java

import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class Solution {
    public static void main(String[] args)
        Scanner reader = new Scanner(System.in);
        int nSentences = Integer.parseInt(reader.nextLine());
        String[] sentences = new String[100];
        int i;
        for( i = 0 ; i < nSentences; i++)
            sentences[i] = reader.nextLine();
        int nWords = Integer.parseInt(reader.nextLine());
        for( i = 0 ; i < nWords ; i++)
            String word = reader.nextLine();
            Pattern p = Pattern.compile("\\b"+word+"\\b");
            int count = 0;
            for(int j = 0 ; j < nSentences ; j++)
                Matcher m = p.matcher(sentences[j]);
                while( m.find())

HackerRank Find a Word Solution in Python

import re
n = int(raw_input())
words = []
regex = "[^a-zA-Z0-9_]*"
for i in range(0, n):
    words += re.split(" *", raw_input())
t = int(raw_input())
for i in range(0, t):
    s = raw_input()
    count = 0
    for w in words:
        for e in re.split(regex, w):
            if e == s: count += 1
    print count

HackerRank Find a Word Solution in JavaScript

process.stdin.on("data", function (input) {
	input = input.split('\n');
	var n = parseInt(input[0]),
		t = parseInt(input[n+1]),
		ts = n+2,
		strs = input.slice(1,n+1).join(' ').split(' '),
		tc = input.slice(ts,ts+t),
		tcc = new Array(),
		c = 0, r, m = false;
	for (i=0, j=tc.length; i<j; i+=1) {
		c = 0;
		r = new RegExp('(?:[\\W]'+tc[i]+'(?![\\w])|(?![\\w])'+tc[i]+'[\\W])','ig');
			for (ii=0, jj=strs.length; ii<jj; ii+=1) {
				var tmp = '-'+strs[ii]+'-';
				m = tmp.match(r);
				if (m) {
					c += m.length;

HackerRank Find a Word Solution in PHP

$_fp = fopen("php://stdin", "r");
/* Enter your code here. Read input from STDIN. Print output to STDOUT */
fscanf($_fp, "%d", $m);
$lines = array();
for ($i = 0; $i < $m; $i++) {
    $lines[] = fgets($_fp);
$lines = preg_split('/[^0-9a-z_]+/', implode(' ', $lines));
$lines = implode(' ', $lines);
fscanf($_fp, "%d", $m);
$searches = array();
for ($i = 0; $i < $m; $i++) {
    $searches[] = trim(fgets($_fp));
foreach ($searches as $search) {
    $search = '/\b' . $search . '\b/';
    print preg_match_all($search, $lines, $matches) . PHP_EOL;

Disclaimer: This problem (Find a Word) is generated by HackerRank but the solution is provided by Chase2learn. This tutorial is only for Educational and Learning purposes.


1. How do you solve the first question in HackerRank?

If you want to solve the first question of Hackerrank then you have to decide which programing language you want to practice i.e C programming, Cpp Programing, or Java programming then you have to start with the first program HELLO WORLD.

2. How do I find my HackerRank ID?

You will receive an email from HackerRank to confirm your access to the ID. Once you have confirmed your email, the entry will show up as verified on the settings page. You will also have an option to “Make primary”. Click on that option. Read more

3. Does HackerRank detect cheating?

yes, HackerRank uses a powerful tool to detect plagiarism in the candidates’ submitted code. The Test report of a candidate highlights any plagiarized portions in the submitted code and helps evaluators to verify the integrity of answers provided in the Test.

4. Does HackerRank use camera?

No for coding practice Hackerrank does not use camera but for companies’ interviews code submission time Hackerrank uses the camera.

5. Should I put HackerRank certificate on resume?

These certificates are useless, and you should not put them on your resume. The experience you gained from getting them is not useless. Use it to build a portfolio, and link to it on your resume. 

6. Can I retake HackerRank test?

The company which sent you the HackerRank Test invite owns your Test submissions and results. It’s their discretion to permit a reattempt for a particular Test. If you wish to retake the test, we recommend that you contact the concerned recruiter who invited you to the Test and request a re-invite. 

7. What is HackerRank?

HackerRank is a tech company that focuses on competitive programming challenges for both consumers and businesses. Developers compete by writing programs according to provided specifications. Wikipedia

Finally, we are now, in the end, I just want to conclude some important message for you

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