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Code Issues Projects Releases Wiki Activity

Implementation day 18

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Bert Peters
2020-12-18 18:48:11 +01:00
parent c666b1f78d
commit 9d5019501a
2 changed files with 550 additions and 2 deletions
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@@ -0,0 +1,373 @@
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6 + 9 + (7 + (3 * 7 * 6 + 6 + 7 + 4) * 9) * 8 + 8
3 * 3 * 7 + ((9 * 7 * 3 * 5 + 4 * 8) + (8 * 4 + 3) + 4 * 4 + 6 * (8 * 8)) + 6 * 8
(6 * 7) + 6 + ((7 * 3) * 2 + 7 + 2) * 6 * 5 * 3
(9 + 5 + 8 + 3) + (2 * 4)
7 * 2 * 8 + 3 + (7 + (7 + 5 * 8 + 3 * 8)) + (2 + (2 + 3 + 3 + 2 * 2 * 9) * 9 * (5 * 9))
(7 + (8 + 7 + 3 + 8 + 4)) + 4 + 7 * 5
3 + ((6 + 9 * 6 * 6) * (9 * 2 + 3) + 6 + 2) * 6
(9 * 2 + 5 + 7) + 3 + ((5 * 8 + 6 * 4 + 8 + 7) + 2 + 7 * 2 * 6 * (2 + 7 + 4)) + 2 + 6
5 * 4 + (6 + 7 * 4) * 9 + 3
(7 + 8 * 2 + 9) * 2 * 7 + 4 + (3 + 5 + 3 * 6 * 5 + 2) + 2
(4 * (3 + 9) * 8 + (3 + 3 * 3 * 8 * 6 * 4) + 5) + (3 * (6 + 7 * 6 * 3 + 5) + (8 + 4 * 6 * 4) * 4 + 2) * 5 * 2 + ((7 + 4 * 9 + 5 + 6) * 4 * (8 + 8 * 2 * 2)) + 9
3 + (8 + 2 + 3 + 9) + 6 + (9 * 3 * 6) * 2 * 8
2 + 8 * (3 + 2 + (6 + 8 + 2 + 5 + 4)) * 8
9 * ((7 * 4) * 3) * 3 * (3 + 2 + 7 + 2 + 5) + 9
8 + ((2 + 6 + 4) + 7 * (4 * 7 + 3) * 5 + 9 * (3 * 9 + 5 * 9 * 4 + 8))
8 + (8 * 6 * 4 * (8 * 3 + 9)) * 3 * 9 * 7
(4 * 3 + 8) + (4 + 2 * 5 * 4 * 8 + 5) * 6 * 3 + (4 * (7 + 5 * 3 + 8 + 6) * 3 + 4 + 7)
(7 + 4 * 3 * 7 * 4 + 6) + ((3 + 6 + 3 + 2 + 2) * 8) * 4 * 3 + 3
5 + 7 + (8 + 9 * (6 + 8) + (8 + 4 + 3) * (4 * 7 + 2 + 7 * 8 + 7) * (6 * 7 + 9 + 2 * 5)) + 4 * 7
(6 + 7 + 2 * (9 * 7 * 5 + 2 + 3) + 6) * 7
9 * ((2 * 7 + 3) * 3 + 7 + 4) * (9 + 7 + 9 * (4 * 7) + 3) + 9 + 2 + 2
((2 * 6 * 9 + 4 + 2 + 5) * (6 * 9 * 6 + 9 + 3 * 2) + 8) * 2
2 * (9 + 9 + 8) + 8 + 5 + (7 * 9 * 4 * 7 * 7 + (4 + 8 + 5 * 7 + 6)) + 2
(7 * 9 * 8) + (3 + 3 * (6 + 7)) * 9
(6 + 8 + 7 * (6 + 4 + 8 + 4 + 9 * 2)) + 6 * 5 + 5 + 6
(7 * 3 * (9 + 3 * 5) + 9 + 4 + 5) + 5 + 9
((9 + 9) + (9 * 8 + 9 * 7 + 9)) * (9 * 4 * 5) * 4 + 5 + (3 * 5 * 3 * 2) * 5
5 + 6 + 6 * 3 + (2 * 2)
4 + ((5 + 3 + 4 + 8) * 5 + 8 * 6 + 3) * ((4 * 2 * 2) + (2 * 9 * 3 + 7) + 5) + 5 + 4 + 4
9 + (4 + (7 * 6 + 5 * 9) * (9 * 3) + 6 * 2) * 3 * 2
(5 * 8 * (3 + 5 * 9 + 3) * 6 + 4) + 2 + 6 * 4
2 * (8 * 4 * (8 + 2) * (9 + 2 + 3 + 2 * 3)) + (7 + (7 * 8 * 3 + 8 * 7 * 4) * 4 * 3 + 9 + 3) * 2 + 4
2 + (3 * 2 * 3 * 6 + (7 * 3 + 9 + 5 + 8)) * 5 + 3 + ((9 + 7 + 5 * 5 * 7 * 7) * 2 * 7 + 3 * (3 + 4)) + ((3 * 2 + 3) + 7 + 5 * 9 + 8 + (8 + 6 + 9 + 8))
5 * ((6 * 6) + 2 + 6 * (6 + 2 * 5 + 3) * 5 + 5) * 7 * 5 * 8 * (6 * (8 + 9) * (9 * 6 * 9 * 7 + 5) * 8)
2 + 6 + (2 * 9 * 3 * 4 + (5 + 9 + 7 + 4 + 4 * 9)) * 5 + 2 * 9
8 * 7 + 6 * 9 + 8 * (4 + 7 * 2 * (6 + 5) * 5)
(6 * 2) + (9 + 3 + 9 + 2)
(8 * (6 + 4) * (3 + 6 + 6 * 7 * 2 * 3) + 4) * ((9 * 2 * 3 + 3 * 6 + 8) + 5 + (7 + 3) * 7 * 3 * 5) + 7 * 5
7 + (2 + 7 + 4 + (3 + 3 * 3 * 5 * 4) + (2 * 6 + 6 + 9)) * (7 + 7) * 6 * (2 * 5 * 5 * 6 + 5 + 8)
5 * 3 + 4 + 3 + (6 * 7 * 4 * (2 + 5 + 3 + 8) * 9 * 7)
5 + 6 * (4 * 4 + 8) * ((2 + 4 + 8 * 5) + 7 * 8 + (5 * 4 + 9 + 7 + 9) * (6 + 7 * 9 * 7 * 7) + (6 + 7 * 7 * 6 * 3 + 4)) + 6 + 5
5 + 2 * 6 + (6 * 4) * 7
4 * 7
(5 + (3 * 8 + 2 + 7 + 6) + 6 * (8 + 6) * (9 + 3 * 6 * 7 + 2) + (8 * 2 * 6 + 7 * 7)) + 7 + 6 + 3 + 7
9 * 8 * (9 + 9 + 4 + 5) * (6 + 6 * 7)
(2 * 9 + 2) + 7 + (8 * 5 * 6) * 5 * (7 * 4 * 5 + 6 * 8 + 3) * 8
2 + 9 + (3 * 5 * 4 * (9 * 4 * 3 * 3 + 2)) * 4 * 6 + 2
9 * 9 * (4 * 4) * (6 * 7 + 8 * 7 * 4) * 8 + 2
(4 + 7 * 7) + 2 + 3 * (2 * 2 + 2) * (2 * 5 * 2 + 3 * 5)
4 + 9 + (3 + 5 + 3) + 9
6 + (4 * 2 + 6) + (6 + (8 * 6 + 3 * 5 + 6 * 8) * 8) + 4
6 * (8 + 4 * 8 + 6 + 3 + 7) + 9 + (2 + 8) + 4
9 + 4 * 7 + 2 + 2 + (6 + 9)
7 + 3 + ((8 * 3 + 7) * 7 * (8 + 6) + 5 + 8) * 4
6 + ((2 + 2 * 9) + 2) * 8 + 3 + 4
((5 * 6 + 4 * 6 + 3) * 4 * (2 * 9 * 2 + 7 + 7) * 4 + 2 * 3) * 4
2 * 3 + 5 * ((4 * 9 + 6 * 5 + 4) * (2 + 9 * 7 + 7 * 8 + 7) * 6 + 5 * 4 * 6)
(7 + 7 * 6 * 3 + 4) + 4 * 8 * 7 * 6 * (9 + 8 + (8 + 2 + 7 + 8 * 7) + (4 + 7 + 7 + 6) * 5)
6 * (8 + 8 * 4 * 8 + 4 + 5) + 8
(4 * (6 * 5 + 8 + 7 * 4) * (5 + 4 + 3 * 7 * 8 * 4) + 6 * (3 + 6) * 8) + 3 + (5 * (6 + 6 + 8) * 4) + 2 * ((8 * 9 * 8) + (9 * 8 * 9 * 9 + 8 + 7) + 7)
4 * (9 * 3 + 8 + 4 + 4) * 5 * 5
7 + ((6 * 6 + 2) + 4 * 3 * 8 + 4)
(8 + 4 * 3 * (9 + 4) * 5) * 6 * 6
(3 * (7 + 3) * (5 + 6) + 5 * 5) * 3 * 7 * 5 + 5 + 8
2 + (4 + 8 + (5 + 6)) * 5 * 4 * 9
6 * 3 + 3 * 3 + 5 * (9 + 8 * 5 * 3 + 3 * 3)
(3 + 8) + 4 * (4 * (4 + 5 + 9 + 3 * 6 * 9) + 9 * 9 + (4 + 2 * 7)) * 7 + 2
(2 + (8 + 2 * 3)) + (3 * 2 + 5 * (4 + 2 + 8) + (9 + 5 + 3 * 6)) + (3 + 9 * (3 * 2 * 5 + 3))
2 + (7 + 4 * (6 + 4 * 6) + 3 * 8) + 5 * 2 + 5
((6 * 2) * 8 * 7 * (7 + 9 * 6) + 2) * 2 * 7 + 9 + 4
6 * (5 * 6) + 3
(8 + 8 * 7 + 8 * 6) * (8 + 4 * (5 + 9 + 8)) * (3 * 2 * 9 * 4 + 7 * (3 + 4)) + 7
2 * 8
4 + 3 + 3
5 + (5 * 8 + 5 + 9 * 9 * (9 + 4))
(8 + 5) * (7 + 5 + 2) + 5 * 8 + ((9 * 5) * (7 + 5 + 6 + 7) * 6)
(2 * 2 * 3 + 6 * 5 + 8) * 3 + 3
((6 + 7 + 9 + 6 + 3) + 5 + 7 + (4 * 7 + 2) + 5) + 6 + (2 * 6)
2 + 6 + 6 + (7 * 8 * (4 + 5 * 8 * 6 * 3 * 7) * (3 + 8 * 9 + 8 + 4)) + 5
8 * 9 + (8 * 7 * 4 * (7 * 6 * 8) + (8 * 6 + 8))
(6 * 5 * (9 + 7 * 2 * 8 + 7 * 6)) * 6 * 5
((3 * 5 + 5) + 2 + (5 + 4 + 7) + 6 * (8 + 2)) * 7
5 + (5 * 6 + 8 * 2 * (7 + 9 + 9 + 3 + 9 * 4) + 5) * 6 + 6 * 9
8 + 4 * 6 + 5
(7 * 2) * 9 * 9 + 5
(3 + 7 * 4 + 8 + 4 * (5 * 6)) + 2 * 4 * 5 + 4
(9 * (4 + 4 * 5 * 2 * 2) * 9 * (9 * 9 + 3 * 9 + 4 * 3) + 8 * 6) + (2 * 6 * 5 * (3 + 2 + 8 * 8) + 2 * 5) * 7 + 2
(4 * (7 * 7 * 7 + 5 + 7 * 9) + (4 + 9 + 8) + (3 * 6)) + 6 + 3 + 8
6 + (3 * (5 + 3 + 7 + 5 * 5 * 3)) + (9 * (6 + 6 * 4 + 2)) * 7
(8 + (5 * 3) + 5) + 8 + ((5 * 7) * 3 + (4 + 3 * 6 + 6) * 8 * (9 + 7 + 8)) * 7
7 * 7
4 * 8 * 5 + 7
3 + ((4 + 4 + 5 + 5 + 3) + 5 + (4 * 3 * 9 * 4)) + 7
(2 + 8 * (6 * 2 + 4 * 6) * 8 * 7 + 7) + 5 + (8 + 7 * 3)
8 * (7 * 3 + (9 + 3 + 7) * 3 + 2 + 8) * 9 * 6 + 8 + 7
9 * 9 + 9 * (9 + 2 + (8 + 9 * 4 + 3 * 4 * 9) * 9 * (8 + 5 + 7) + 3) + 7
(7 * 6 * 5 * 6) + 6
3 * 5 * 7 + 2 + (9 * 8 + (9 + 7 * 8) * (6 * 8 * 4 * 7 * 9) * 7) * 4
2 * 3 * 6
3 * (7 + 6 + 4 + (3 * 3 * 2 * 2 * 5) * 7 * 6) + 3 * 8 * (3 + 4 + 8 * 9 + 2)
(6 + 6 * 6 + 4) * 6 + 6 + (7 * 6 + (2 * 3 + 3 * 4 + 6) + (9 + 7 * 7 * 3 + 3))
2 * (7 * 3 * 7 + 5 * 9) * 5 * 6 * 6
3 + (7 + 4 + 4) + 9 + (8 * 6 * 7)
(6 + (7 + 5 * 9 + 8 + 9) + 2 + 4) * (2 * 4 + 3 + 2 * 9)
2 + (9 + 8 * 9 + 9 + 8 * (8 * 9 * 3 * 6 * 5)) + 6 + 3 * 6

179
2020/src/day18.rs
View File

@@ -1,12 +1,187 @@
use std::io::Read;
use crate::common::Lines;
use crate::Solution;
#[derive(Clone, Copy)]
enum Op {
Addition,
Multiplication,
}
fn extract_brackets(with_brackets: &str) -> (&str, &str) {
let mut brackets = 1;
let mut end = None;
for (i, c) in with_brackets.chars().enumerate().skip(1) {
match c {
'(' => brackets += 1,
')' => brackets -= 1,
_ => {}
}
if brackets == 0 {
end = Some(i);
break;
}
}
let end = end.expect("Unmatched brackets");
let next_start = with_brackets.len().min(end + 2);
(&with_brackets[1..end], &with_brackets[next_start..])
}
fn compute_value(expression: &str) -> u64 {
let mut remainder = expression;
let mut value = 0;
let mut op = None;
let mut apply_value = |n, op| match op {
Some(Op::Addition) => value += n,
Some(Op::Multiplication) => value *= n,
None => value = n,
};
while !remainder.is_empty() {
let pos = remainder.find(' ');
let part = if let Some(pos) = pos {
&remainder[..pos]
} else {
remainder
};
match part.chars().next().unwrap() {
'+' => op = Some(Op::Addition),
'*' => op = Some(Op::Multiplication),
'(' => {
let (in_brackets, rest) = extract_brackets(remainder);
remainder = rest;
let n = compute_value(in_brackets);
apply_value(n, op);
// Skip the remainder update
continue;
}
c if c.is_ascii_digit() => {
let n = part.parse().unwrap();
apply_value(n, op);
}
_ => panic!("Not a valid expression part {}", part),
}
let pos = pos.map(|n| n + 1).unwrap_or(remainder.len());
remainder = &remainder[pos..];
}
value
}
fn compute_value2(expression: &str) -> u64 {
let mut remainder = expression;
let mut value = 0;
let mut result = 1;
let mut op = None;
let mut apply_value = |n, op| match op {
Some(Op::Addition) => value += n,
Some(Op::Multiplication) => {
result *= value;
value = n;
}
None => value = n,
};
while !remainder.is_empty() {
let pos = remainder.find(' ');
let part = if let Some(pos) = pos {
&remainder[..pos]
} else {
remainder
};
match part.chars().next().unwrap() {
'+' => op = Some(Op::Addition),
'*' => op = Some(Op::Multiplication),
'(' => {
let (in_brackets, rest) = extract_brackets(remainder);
remainder = rest;
let n = compute_value2(in_brackets);
apply_value(n, op);
// Skip the remainder update
continue;
}
c if c.is_ascii_digit() => {
let n = part.parse().unwrap();
apply_value(n, op);
}
_ => panic!("Not a valid expression part {}", part),
}
let pos = pos.map(|n| n + 1).unwrap_or(remainder.len());
remainder = &remainder[pos..];
}
result * value
}
#[derive(Default)]
pub struct Day18;
impl Solution for Day18 {
fn part1(&mut self, _input: &mut dyn Read) -> String {
todo!()
fn part1(&mut self, input: &mut dyn Read) -> String {
Lines::new(input)
.map(|l| compute_value(&l))
.sum::<u64>()
.to_string()
}
fn part2(&mut self, input: &mut dyn Read) -> String {
Lines::new(input)
.map(|l| compute_value2(&l))
.sum::<u64>()
.to_string()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn sample_part1() {
assert_eq!(71, compute_value("1 + 2 * 3 + 4 * 5 + 6"));
assert_eq!(51, compute_value("1 + (2 * 3) + (4 * (5 + 6))"));
assert_eq!(26, compute_value("2 * 3 + (4 * 5)"));
assert_eq!(437, compute_value("5 + (8 * 3 + 9 + 3 * 4 * 3)"));
assert_eq!(
12240,
compute_value("5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))")
);
assert_eq!(
13632,
compute_value("((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2")
);
}
#[test]
fn sample_part2() {
assert_eq!(231, compute_value2("1 + 2 * 3 + 4 * 5 + 6"));
assert_eq!(51, compute_value2("1 + (2 * 3) + (4 * (5 + 6))"));
assert_eq!(46, compute_value2("2 * 3 + (4 * 5)"));
assert_eq!(1445, compute_value2("5 + (8 * 3 + 9 + 3 * 4 * 3)"));
assert_eq!(
669060,
compute_value2("5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))")
);
assert_eq!(
23340,
compute_value2("((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2")
);
}
}