--- /dev/null
+{
+ "cells": [
+ {
+ "cell_type": "code",
+ "execution_count": 1,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+ "source": [
+ "import itertools"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 2,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+ "source": [
+ "def coordinates():\n",
+ " row = 1\n",
+ " col = 1\n",
+ " while True:\n",
+ " yield row, col\n",
+ " if row == 1:\n",
+ " row = col + 1\n",
+ " col = 1\n",
+ " else:\n",
+ " row -= 1\n",
+ " col += 1"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 3,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "[(1, 1),\n",
+ " (2, 1),\n",
+ " (1, 2),\n",
+ " (3, 1),\n",
+ " (2, 2),\n",
+ " (1, 3),\n",
+ " (4, 1),\n",
+ " (3, 2),\n",
+ " (2, 3),\n",
+ " (1, 4),\n",
+ " (5, 1),\n",
+ " (4, 2),\n",
+ " (3, 3),\n",
+ " (2, 4),\n",
+ " (1, 5),\n",
+ " (6, 1),\n",
+ " (5, 2),\n",
+ " (4, 3),\n",
+ " (3, 4),\n",
+ " (2, 5)]"
+ ]
+ },
+ "execution_count": 3,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "list(itertools.islice(coordinates(), 20))"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 4,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+ "source": [
+ "def code():\n",
+ " c = 20151125\n",
+ " while True:\n",
+ " yield c\n",
+ " c = (c * 252533) % 33554393"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 7,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "{(1, 1): 20151125,\n",
+ " (1, 2): 18749137,\n",
+ " (1, 3): 17289845,\n",
+ " (1, 4): 30943339,\n",
+ " (1, 5): 10071777,\n",
+ " (2, 1): 31916031,\n",
+ " (2, 2): 21629792,\n",
+ " (2, 3): 16929656,\n",
+ " (2, 4): 7726640,\n",
+ " (2, 5): 15514188,\n",
+ " (3, 1): 16080970,\n",
+ " (3, 2): 8057251,\n",
+ " (3, 3): 1601130,\n",
+ " (3, 4): 7981243,\n",
+ " (4, 1): 24592653,\n",
+ " (4, 2): 32451966,\n",
+ " (4, 3): 21345942,\n",
+ " (5, 1): 77061,\n",
+ " (5, 2): 17552253,\n",
+ " (6, 1): 33071741}"
+ ]
+ },
+ "execution_count": 7,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "{k: v for k, v in zip(itertools.islice(coordinates(), 20), code())}"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 11,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "[(4, 4)]"
+ ]
+ },
+ "execution_count": 11,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "list(itertools.islice(itertools.dropwhile(lambda c: not (c[0] == 4 and c[1] == 4), coordinates()), 1))"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 17,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "data": {
+ "text/plain": [
+ "{(2981, 3075): 9132360}"
+ ]
+ },
+ "execution_count": 17,
+ "metadata": {},
+ "output_type": "execute_result"
+ }
+ ],
+ "source": [
+ "# To continue, please consult the code grid in the manual. Enter the code at row 2981, column 3075.\n",
+ "target_row = 2981\n",
+ "target_col = 3075\n",
+ "{k: v for k, v in itertools.islice(itertools.dropwhile(lambda c: not (c[0][0] == target_row and c[0][1] == target_col), \n",
+ " zip(coordinates(), code())),\n",
+ " 1)}"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+ "source": []
+ }
+ ],
+ "metadata": {
+ "kernelspec": {
+ "display_name": "Python 3",
+ "language": "python",
+ "name": "python3"
+ },
+ "language_info": {
+ "codemirror_mode": {
+ "name": "ipython",
+ "version": 3
+ },
+ "file_extension": ".py",
+ "mimetype": "text/x-python",
+ "name": "python",
+ "nbconvert_exporter": "python",
+ "pygments_lexer": "ipython3",
+ "version": "3.4.3"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}