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Added Day 5 Part 2

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Ishan Jain 2020-12-05 11:05:41 +05:30
parent 2c6be28d86
commit 9aea6f16f5
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1 changed files with 28 additions and 31 deletions
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59
src/main.rs
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@ -1,58 +1,55 @@
use std::collections::HashSet;
use std::io::{stdin, Read};
fn main() {
let mut input = String::new();
stdin().read_to_string(&mut input).unwrap();
let max_seat_id: usize = input
let filled_seats = input
.split('\n')
.filter(|x| !x.is_empty())
.into_iter()
.map(|seat| {
let seat = seat.as_bytes();
let (region, columns) = seat.split_at(7);
let mut region_lower = 0;
let mut region_upper = 127;
let mut col_lower = 0;
let mut col_upper = 7;
let mut lower = 0;
let mut upper = 127;
for r in region {
match r {
for s in seat.as_bytes() {
match s {
b'F' => {
let mid = (lower + upper) / 2;
upper = mid;
let mid = (region_lower + region_upper) / 2;
region_upper = mid;
}
b'B' => {
let mid = (lower + upper + 1) / 2;
lower = mid;
let mid = (region_lower + region_upper + 1) / 2;
region_lower = mid;
}
_ => unreachable!(),
}
}
let region = lower;
lower = 0;
upper = 7;
for col in columns {
match col {
b'L' => {
let mid = (lower + upper) / 2;
upper = mid;
let mid = (col_lower + col_upper) / 2;
col_upper = mid;
}
b'R' => {
let mid = (lower + upper + 1) / 2;
lower = mid;
let mid = (col_lower + col_upper + 1) / 2;
col_lower = mid;
}
_ => unreachable!(),
}
}
let col = lower;
let region = region_lower;
let col = col_lower;
region * 8 + col
})
.max()
.unwrap();
.collect::<HashSet<usize>>();
println!("{:?}", max_seat_id);
let min = *filled_seats.iter().min().unwrap();
let max = *filled_seats.iter().max().unwrap();
for i in min..max {
if !filled_seats.contains(&i) {
println!("seat = {}", i);
break;
}
}
}