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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Java Easy Challenges</title>
<style>
body {
background-color: #1e1e1e;
color: #e0e0e0;
font-family: 'JetBrains Mono', monospace;
padding: 2rem;
}
.container {
max-width: 1500px;
margin: auto;
}
h1 {
margin-bottom: 1rem;
}
.problem-description {
background: #272727;
padding: 1.5rem;
border-radius: 8px;
margin-bottom: 2rem;
}
textarea {
width: 100%;
height: 200px;
background: #141414;
color: #00ffa6;
border: none;
border-radius: 6px;
font-family: 'JetBrains Mono', monospace;
font-size: 1rem;
padding: 1rem;
resize: vertical;
}
.console {
background: #141414;
color: #00ffa6;
padding: 1rem;
border-radius: 6px;
height: 200px;
overflow-y: auto;
white-space: pre-wrap;
margin-top: 1rem;
font-size: 0.9rem;
}
button {
margin-top: 1rem;
background-color: #00bcd4;
border: none;
color: white;
font-weight: bold;
padding: 0.75rem 1.5rem;
border-radius: 6px;
cursor: pointer;
transition: background-color 0.3s ease;
}
button:hover {
background-color: #0097a7;
}
</style>
</head>
<body>
<h1>Java Medium Challenges</h1>
<div id="problem"></div>
<textarea id="codeEditor"></textarea>
<div>
<button id="prevBtn" disabled>Previous</button>
<button id="runBtn">Run Code</button>
<button id="nextBtn">Next</button>
</div>
<div id="scoreDisplay" style="text-align: center; margin-top: 0.5rem; font-weight: bold;">
Score: 0 / 25
</div>
<script>
const firebaseConfig = {
apiKey: "AIzaSyBTqasiZ6zn3D2oFdtwQFR8YowBGyUTzoI",
authDomain: "code-quest-c5cc6.firebaseapp.com",
projectId: "code-quest-c5cc6",
storageBucket: "code-quest-c5cc6.firebasestorage.app",
messagingSenderId: "166511404658",
appId: "1:166511404658:web:1d78060d55a26eaff884eb"
};
const questions = [
{
problem: 'Write a Java program to check if a number is prime.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to find the factorial of a number using recursion.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to reverse a string.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to check if a string is a palindrome.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to find the largest element in an array.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to sort an array using bubble sort.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to count the occurrences of each character in a string.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to merge two sorted arrays into a single sorted array.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to find the GCD (Greatest Common Divisor) of two numbers.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to calculate the Fibonacci series up to n terms.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to remove duplicates from an array.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to check if two strings are anagrams.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to implement a basic calculator using switch-case.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to find the second largest number in an array.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to count the number of vowels and consonants in a string.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to print all Armstrong numbers between 1 and 1000.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to find the sum of digits of a number.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to check if a number is an Armstrong number.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to find the missing number in an array containing n-1 integers.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to check if a year is a leap year.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to calculate the power of a number using recursion.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to convert decimal number to binary.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to implement linear search in an array.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to reverse the words in a sentence.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
{
problem: 'Write a Java program to find the longest substring without repeating characters.',
boilerplate: `public class Main {
public static void main(String[] args) {
// Your code here
}
}`,
},
];
let currentIndex = 0;
let score = 0;
const problemEl = document.getElementById('problem');
const codeEditor = document.getElementById('codeEditor');
const prevBtn = document.getElementById('prevBtn');
const nextBtn = document.getElementById('nextBtn');
const runBtn = document.getElementById('runBtn');
const scoreEl = document.getElementById('scoreDisplay');
scoreEl.textContent = `Score: ${score} / ${questions.length}`;
function loadQuestion(index) {
const q = questions[index];
problemEl.innerHTML = `<h3>Question ${index + 1}:</h3><p>${q.problem}</p>`;
codeEditor.value = q.boilerplate;
prevBtn.disabled = index === 0;
nextBtn.disabled = index === questions.length - 1;
}
prevBtn.onclick = () => {
if (currentIndex > 0) {
currentIndex--;
loadQuestion(currentIndex);
}
};
nextBtn.onclick = () => {
if (currentIndex < questions.length - 1) {
currentIndex++;
loadQuestion(currentIndex);
}
};
runBtn.onclick = () => {
const userCode = codeEditor.value;
const valid = questions[currentIndex].validate(userCode);
if (valid) {
alert("Correct!");
if (!questions[currentIndex].scored) {
score++;
questions[currentIndex].scored = true;
scoreEl.textContent = `Score: ${score} / ${questions.length}`;
}
} else {
alert("Incorrect, try again.");
}
};
loadQuestion(currentIndex);
</script>
</body>
</html>