24.py

import re
import sys
import itertools

def solve(numbers):
    ops = "+ - * / // **".split(" ")
    wrap = ["", "("]
    wclo = ["", ")"]
    minu = ["", "-"]
    def executes (number, m1,m2,m3,a,b,c):
        for w1 in wrap:
            e = w1 + m1 + str(number[0]) + ".0"
            e += a
            for w2 in wrap:
                b1 = e
                e += w2 + m2 + str(number[1]) + ".0"
                for c1 in wclo:
                    b2 = e
                    if w1 == "(":
                        e += c1
                    e += b
                    for w3 in wrap:
                        b3 = e
                        e += w3 + m3 + str(number[2]) + ".0"
                        if w1 == "(" and c1 == "":
                            e += ")"
                        for c2 in wclo:
                            b4 = e
                            if w2 == "(":
                                e += c2
                            e += c
                            e += str(number[3]) + ".0"
                            if w2 == "(" and c2 == "":
                                e += ")"
                            if w3 == "(":
                                e += ")"
                            try:
                                if abs(eval(e) - 24) < 1e-15:
                                    return e.replace(".0", "")
                            except:
                                pass
                            e = b4
                        e = b3
                    e = b2
                e = b1
    iterN = itertools.permutations(numbers, 4)
    for number in iterN:
        for m1 in minu:
            for m2 in minu:
                for m3 in minu:
                    for a in ops:
                        for b in ops:
                            for c in ops:
                                result = executes(number, m1,m2,m3,a,b,c)
                                if result: return result

while True:
    r = raw_input("")
    # print >> sys.stderr, r
    m = re.search('\[(\d+), (\d+), (\d+), (\d+)\]', r)
    if not m:
        continue
    numbers = [m.group(1), m.group(2), m.group(3), m.group(4)]
    print >> sys.stderr, solve(numbers)

runner.js

var spawn = require('child_process').spawn,
    log = console.log,
    main = function () {
        var nc = spawn('nc', ['210.65.89.59', '2424']);
        var p24 = spawn('python', ['24n.py']);
        nc.stdout.pipe(p24.stdin);
        p24.stderr.pipe(nc.stdin);

        nc.stdout.on('data', function (data) {
            log(data.toString());
        });
        p24.stderr.on('data', function (data) {
            log(data.toString());
        });
        nc.on('close', function (code, signal) {
            console.log('child process terminated due to receipt of signal '+signal);
            main();
        });
    }
main();
main();