day17: part 1: implement alternative solution

day17: part 1: implement solution

day16: implement... more solutions.

day16: implement more solutions

day16: implement solutions

day15: implement solutions

day15: part 1: partially implement solution

day14: implement solutions

day14: part 1: implement solution

day12: implement visualized solutions

day12: part 2: correct file name

day13: part 2: implement solution

day13: part 1: implement solution

day12: part 2: implement solution

day12: part 1: add debug output; add tests

day12: part 1: implement solution

day12: write tests for load-heightmap

day12: improve load-heightmap: return start-pos, end-pos

day12: load the heightmap into an vectorof vectorof integer

day11: part 2: implement solution