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use std::io::{self, Read};
fn solve1(input: &str) -> u32 {
let mut jumps: Vec<isize> = input.lines()
.map(str::parse)
.map(Result::unwrap)
.collect();
let mut index = 0isize;
for step in 0.. {
if index < 0 || index >= jumps.len() as isize {
return step;
}
let jump = &mut jumps[index as usize];
index += *jump;
*jump += 1;
}
unreachable!()
}
fn solve2(input: &str) -> u32 {
let mut jumps: Vec<isize> = input.lines()
.map(str::parse)
.map(Result::unwrap)
.collect();
let mut index = 0isize;
for step in 0.. {
if index < 0 || index >= jumps.len() as isize {
return step;
}
let jump = &mut jumps[index as usize];
index += *jump;
if *jump >= 3 {
*jump -= 1;
} else {
*jump += 1;
}
}
unreachable!()
}
fn main() {
let mut input = String::new();
io::stdin().read_to_string(&mut input).unwrap();
println!("Part 1: {}", solve1(&input));
println!("Part 2: {}", solve2(&input));
}
#[test]
fn part1() {
assert_eq!(5, solve1("0\n3\n0\n1\n-3\n"));
}
#[test]
fn part2() {
assert_eq!(10, solve2("0\n3\n0\n1\n-3\n"));
}
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