code-jam-helpers (node.js)

This is a collection of helper functions for JavaScipt for Google Code Jam coding contest. The helpers include:

• io - read/write input/output in a CodeJam friendly way.
• IMPOSSIBLE constant
• dependencies (installs with the package):
  • BigNumber library for tackling big inputs.

Installation

npm install code-jam-helpers

Input

Input is expected to have Linux style line endings '\n'. Watch out for the extra empty line that sometimes appears in input.

Examples

Using for loop for fixed sized input

var codeJam = require('code-jam-helpers');

function solveTestCase(inputLine) {
    //...
}

function solveProblem(input) {
    input = codeJam.io.decomposeInput(input);

    var output = [];

    for (var i = 0; i < input.n; i += 1) {
        var inputLine = input.lines[i];
        output.push(
            codeJam.io.composeOutput(i, solveTestCase(inputLine))
        );
    }

    return output
        .join('\n');
}

codeJam.io.solve('sample.in', 'sample.out', solveProblem);

Using array iterator for variyng size input (2017-1-b/a)

var codeJam = require('code-jam-helpers');

function calculateSpeed(inputLine) {
    //...
}

function solveProblem(input) {
    input = codeJam.io.decomposeInput(input);

    var output = [];

    var i = 0;
    var iterator = input.lines[Symbol.iterator]();

    while (true) {
        var next = iterator.next();

        if (next.done) {
            break;
        }

        var inputLine = next.value
            .split(' ')
            .map(Number);

        var destination = inputLine[0];
        var horsesNumber = inputLine[1];

        var horses = [];

        for (var j = 0; j < horsesNumber; j++) {
            next = iterator.next();

            if (next.done) {
                throw new Error('Unexpected end of input');
            }

            horses.push(next.value);
        }

        output.push(
            codeJam.io.composeOutput(i,
                calculateSpeed(destination, horsesNumber, horses)
            )
        );

        i += 1;
    }

    return output
        .join('\n');
}

codeJam.io.solve('sample.in', 'sample.out', solveProblem);