Advent of Code 2017

I tried to teach myself Rust by solving the Advent of Code 2017. So beware of ugly and non-idiomatic code.

Overview

Day	Part 1	Part 2	How to run solution
1	☑	☑	cargo run (input must be in input.txt in working directory)
2	☑	☑	cargo run (input must be in input.txt in working directory)
3	☑	❎	cargo run 1234 (replace 1234 with your input)
4	☑	☑	cargo run (input must be in input.txt in working directory)
5	☑	☑	cargo run (input must be in input.txt in working directory)
6	☑	☑	cargo run input_file
7	☑	☑	cargo run input_file (part two needs manual labour: it only gives the unbalanced subtree, one still needs to calculate the correct weight)
8	☑	☑	cargo run input_file
9	☑	☑	cargo run input_file
10	☑	☑	cargo run input_file
11	❎	❎
12	❎	❎
13	☑	☑	cargo run input_file (part 2 takes a long time)
14	❎	❎
15	❎	❎
16	☑	☑	cargo run input_file
17	☑	☑	cargo run input_file
18	☑	☑	cargo run input_file
19	❎	❎
20	❎	❎
21	❎	❎
22	❎	❎
23	❎	❎
24	❎	❎
25	❎	❎