Learn-Coding/example.html at main · mithleshprasad/Learn-Coding · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>DSA Problems with Code Editor</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/codemirror.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/theme/dracula.min.css">
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f9f9f9;
            transition: background 0.3s, color 0.3s;
        }
        .dark-mode {
            background-color: #222;
            color: #fff;
        }
        header {
            background-color: #4CAF50;
            color: white;
            padding: 20px;
            text-align: center;
        }
        .container {
            padding: 20px;
        }
        select, button, input[type="file"] {
            padding: 8px;
            margin: 5px;
            font-size: 1em;
        }
        .editor-container {
            background: #ffffff;
            padding: 20px;
            border-radius: 5px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        .dark-mode .editor-container {
            background: #333;
        }
        .editor-header {
            font-size: 1.2em;
            color: #4CAF50;
        }
        #codeEditor {
            border: 1px solid #ddd;
            height: 300px;
        }
        .dark-mode #codeEditor {
            border: 1px solid #555;
        }
        button {
            background-color: #4CAF50;
            color: white;
            border: none;
            cursor: pointer;
        }
        button:hover {
            background-color: #45a049;
        }
        pre {
            background: #f1f1f1;
            padding: 10px;
            border-radius: 5px;
        }
        .dark-mode pre {
            background: #444;
        }
    </style>
</head>
<body>
    <header>
        <h1>DSA Problems with Code Editor</h1>
    </header>

    <div class="container">
        <!-- Problem Selection -->
        <label for="problemSelect">Choose a Problem:</label>
        <select id="problemSelect" onchange="loadProblem()">
            <option value="reverseLinkedList">Reverse a Linked List</option>
            <option value="fibonacci">Find Fibonacci Number</option>
            <option value="factorial">Find Factorial</option>
        </select>

        <!-- Language Selection -->
        <label for="languageSelect">Choose Language:</label>
        <select id="languageSelect" onchange="changeLanguage()">
            <option value="javascript">JavaScript</option>
            <option value="python">Python</option>
            <option value="cpp">C++</option>
        </select>

        <button onclick="toggleDarkMode()">Toggle Dark Mode</button>

        <div class="editor-container">
            <div class="editor-header">Code Editor</div>
            <textarea id="codeEditor"></textarea>
            <button onclick="runCode()">Run Code</button>
            <button onclick="downloadCode()">Download Code</button>
            <input type="file" id="uploadFile" onchange="uploadCode()" />
            <pre id="output"></pre>
        </div>
    </div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/codemirror.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/mode/javascript/javascript.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/mode/python/python.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/mode/clike/clike.min.js"></script>

    <script>
        const editor = CodeMirror.fromTextArea(document.getElementById("codeEditor"), {
            lineNumbers: true,
            mode: "javascript",
            theme: "dracula",
        });

        const problems = {
            reverseLinkedList: {
                javascript: `// Function to reverse a singly linked list
function ListNode(val) {
    this.val = val;
    this.next = null;
}

function reverseLinkedList(head) {
    let prev = null, current = head;
    while (current) {
        let next = current.next;
        current.next = prev;
        prev = current;
        current = next;
    }
    return prev;
}`,
                python: `# Function to reverse a singly linked list
class ListNode:
    def __init__(self, val=0, next=None):
        self.val = val
        self.next = next

def reverse_linked_list(head):
    prev, current = None, head
    while current:
        next = current.next
        current.next = prev
        prev = current
        current = next
    return prev`,
                cpp: `// Function to reverse a singly linked list
struct ListNode {
    int val;
    ListNode* next;
    ListNode(int x) : val(x), next(nullptr) {}
};

ListNode* reverseLinkedList(ListNode* head) {
    ListNode* prev = nullptr, *current = head;
    while (current) {
        ListNode* next = current->next;
        current->next = prev;
        prev = current;
        current = next;
    }
    return prev;
}`
            }
        };

        function loadProblem() {
            const problem = document.getElementById("problemSelect").value;
            const language = document.getElementById("languageSelect").value;
            editor.setValue(problems[problem][language]);
        }

        function changeLanguage() {
            const language = document.getElementById("languageSelect").value;
            editor.setOption("mode", language === "cpp" ? "text/x-c++src" : language);
            loadProblem();
        }

        function runCode() {
            try {
                const userCode = editor.getValue();
                const output = eval(userCode);
                document.getElementById("output").textContent = `Output: ${output}`;
            } catch (error) {
                document.getElementById("output").textContent = `Error: ${error.message}`;
            }
        }

        function downloadCode() {
            const code = editor.getValue();
            const blob = new Blob([code], { type: "text/plain" });
            const link = document.createElement("a");
            link.href = URL.createObjectURL(blob);
            link.download = "code.txt";
            link.click();
        }

        function uploadCode() {
            const file = document.getElementById("uploadFile").files[0];
            if (!file) return;
            const reader = new FileReader();
            reader.onload = function (e) {
                editor.setValue(e.target.result);
            };
            reader.readAsText(file);
        }

        function toggleDarkMode() {
            document.body.classList.toggle("dark-mode");
            editor.setOption("theme", document.body.classList.contains("dark-mode") ? "dracula" : "default");
        }

        loadProblem();
    </script>
</body>
</html>