c_version_robot.rb

# File: c_version_robot.rb
# Author: Luke Hubbard
# Gist: http://gist.github.com/gists/18325
# License: MIT
# Description: C version of the robot for Google Treasure Hunt. 
# Bugs: Cant handle big grids, numbers too big. 

require 'rubygems'
require 'inline'

class CVersion

  inline do |builder|
    builder.include "<stdio.h>"
    builder.c %{
long robot(int rows, int cols) {
  long matrix[rows][cols];
  int x, y;
  for (x = rows-1; x >= 0; x--) {
    for (y = cols-1; y >= 0; y--) {
      long a = (x<rows-1) ? matrix[x+1][y] : 0;
      long b = (y<cols-1) ? matrix[x][y+1] : 0;
      long sum = a + b;
      matrix[x][y] = sum > 0 ? sum : 1;
    }
  }
  return matrix[0][0];
}}
  end
end

puts CVersion.new.robot(17, 17)