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u64::from_str_radix(x, 2).unwrap()) + .collect() } -fn cmds() -> impl Iterator { - INPUT.lines().filter(|&x| !x.is_empty()).map(|x| { - let mut x = x.split_ascii_whitespace(); +fn solution(levels: &[u64]) -> i64 { + let dominant_mask = count_bits::(&levels, true); - let cmd = x.next(); - let val = x.next().map(|x| x.parse::()).unwrap().unwrap(); + let mut gamma = 0; + for i in (0..MAX_LINE_LENGTH).rev() { + let v = dominant_mask & (1 << i); + gamma <<= 1; - match cmd { - Some("forward") => Moves::Forward(val), - Some("down") => Moves::Down(val), - Some("up") => Moves::Up(val), - _ => unreachable!(), - } - }) -} - -struct Ship { - aim: i32, - vert_pos: i32, - hor_pos: i32, -} - -fn solution(moves: impl Iterator) -> i32 { - let mut ship = Ship { - aim: 0, - hor_pos: 0, - vert_pos: 0, - }; - - for mmove in moves { - match mmove { - Moves::Forward(v) => { - ship.hor_pos += v; - ship.vert_pos += ship.aim * v; - } - Moves::Down(v) => ship.aim += v, - Moves::Up(v) => ship.aim -= v, + if v > 0 { + gamma |= 1; + } else { + gamma |= 0 } } - ship.hor_pos * ship.vert_pos + let epsilon = !gamma & ((1 << MAX_LINE_LENGTH as i64) - 1); + gamma * epsilon +} + +fn count_bits(levels: &[u64], dominant: bool) -> u64 { + let n = levels.len(); + let mut count = [0; LINE_LENGTH]; + + for &level in levels.iter() { + for i in 0..LINE_LENGTH { + let c = level & (1 << i); + + if c != 0 { + count[i as usize] += 1; + } + } + } + + let mut mask = 0; + for (i, c) in count.into_iter().enumerate() { + if c >= n - c { + mask |= 1 << i; + } + } + + if dominant { + mask + } else { + !mask + } } fn main() { - let moves = cmds(); - let count = solution(moves); - println!("increased {} times", count); + let moves = cmds(INPUTS[0]); + let count = solution::<5>(&moves); + println!("Result {}", count); + let moves = cmds(INPUTS[1]); + let count = solution::<12>(&moves); + println!("Result {}", count); } #[bench] fn solution_bench(b: &mut test::Bencher) { + let moves = cmds(INPUTS[1]); b.iter(|| { - // Not ideal since we want to benchmark the function - // _excluding_ the time it takes to go through the input - let moves = cmds(); - let v = solution(moves); + let v = solution::<12>(&moves); test::black_box(v); }) } #[test] fn solution_test() { - assert_eq!(solution(cmds()), 1463827010); + assert_eq!(solution::<5>(&cmds(INPUTS[0])), 198); + assert_eq!(solution::<12>(&cmds(INPUTS[1])), 3687446); }