firasx/algorithm-playground

1const express = require('express');2const cors = require('cors');3const bodyParser = require('body-parser');4const { exec } = require('child_process');5const fs = require('fs');6const path = require('path');7 8const app = express();9app.use(cors());10app.use(bodyParser.json());11 12const PORT = process.env.PORT || 5000;13 14// API endpoint to execute algorithms15app.post('/api/execute', (req, res) => {16  const { algorithm, input, language } = req.body;17  18  // Generate a unique filename19  const filename = `temp_${Date.now()}.${language === 'python' ? 'py' : 'js'}`;20  const filepath = path.join(__dirname, 'temp', filename);21  22  // Write the algorithm code to a temporary file23  fs.writeFileSync(filepath, algorithm);24  25  // Execute the code based on language26  const command = language === 'python' ? `python ${filepath}` : `node ${filepath}`;27  28  exec(command, { input }, (error, stdout, stderr) => {29    // Clean up the temporary file30    fs.unlinkSync(filepath);31    32    if (error) {33      return res.status(400).json({ error: stderr });34    }35    36    res.json({ result: stdout });37  });38});39 40// API endpoint to get algorithm templates41app.get('/api/algorithms', (req, res) => {42  const algorithms = {43    sorting: {44      bubble: `def bubble_sort(arr):45    n = len(arr)46    for i in range(n):47        for j in range(0, n-i-1):48            if arr[j] > arr[j+1]:49                arr[j], arr[j+1] = arr[j+1], arr[j]50    return arr`,51      quick: `def quick_sort(arr):52    if len(arr) <= 1:53        return arr54    pivot = arr[len(arr) // 2]55    left = [x for x in arr if x < pivot]56    middle = [x for x in arr if x == pivot]57    right = [x for x in arr if x > pivot]58    return quick_sort(left) + middle + quick_sort(right)`59    },60    searching: {61      binary: `def binary_search(arr, target):62    low, high = 0, len(arr) - 163    while low <= high:64        mid = (low + high) // 265        if arr[mid] < target:66            low = mid + 167        elif arr[mid] > target:68            high = mid - 169        else:70            return mid71    return -1`72    }73  };74  75  res.json(algorithms);76});77 78// Create temp directory if it doesn't exist79if (!fs.existsSync(path.join(__dirname, 'temp'))) {80  fs.mkdirSync(path.join(__dirname, 'temp'));81}82 83app.listen(PORT, () => {84  console.log(`Server running on port ${PORT}`);85});