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[TASK] Solved day 18 (better late than never)

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2020-12-19 20:07:56 +01:00
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commit 006eb5f19e
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2 * 4 + 6 + (9 * 4 * 3 * 4)
(4 * 6 * (3 + 9) + (3 * 5 + 8 * 5 * 9) + 6) + 9 + 8
(3 * 5 + 8) + 8 * 8 * 7 + 8 * (9 + 6)
(5 * 4 * 6 + 3 + 3) * (3 * 8 * (7 + 2 * 9 * 6)) + ((9 * 9 * 4 + 8 * 7 * 7) + 4 * 4) + 8 * 6
3 + 5 * 5 * 6 * ((3 + 3) * 8 + (6 + 9 + 2 + 6 * 7)) * 4
9 + ((4 * 7 + 2 + 2 * 6) + 8 * (4 * 6 + 7 * 5) * 7 + 4) + 6 + 6
(9 + 9 * (8 * 2 + 9 + 5) * 3 * 4 * 4) + 5 * ((3 + 6 * 3 * 7) + 6 * 4) * (3 + 8 * 9 + 6 + (4 + 3 * 4 + 2) + 6)
5 * 5 * (9 + 8 * 3 * 3 + 3) * 4 + 8
3 + (6 * 9 * 8) + 9 + (3 + 3 + 2 + 5 + 2)
3 + 4 * (4 * 8 + 2 * (3 + 3 + 4 + 9 * 7) + 4 + (6 + 9 + 4 * 6 + 9))
6 * 5 * 9 * ((6 + 9 * 6 + 7) + (6 * 4 + 2 * 4 * 6 * 6) + 9 + 6 + 8)
7 + 7 * 2 * 4 + 7 * 2
2 + 8 * (7 + 3 * 3 + 2) + 6 + 3 * 7
2 * 2 * 9 + 8 + 8
9 + 5 + 4 * (6 * 7 * 5 * 7 * 4 * 3) * 3
7 * 5 * 7 * 6 + 4 * 9
((9 + 7 + 9 + 7 * 7 * 4) * 6 * 5) + 5 + (8 + (2 + 6 * 9 * 7 * 9 + 9) * (9 * 3 * 8 + 9 * 6 * 2) + 6 * 7) * (2 + 6 + (3 * 4 + 4) * 6 * 5) * 9 * 5
(7 * 5 * (3 + 2 + 6 * 5 + 9) + 5 + (2 + 9) + 2) + 2 * 6 + (5 * (7 * 2 + 3 + 8 * 9) * 7 + 6 + 6 * (5 + 3 + 9)) * (4 * 6 + (9 + 7 + 4))
((3 + 5) + 7 + 3) + 6
3 * 4 + 4 * 6 + (5 + 8 * 2)
7 + (7 * (4 + 4)) * 3 + 7 * 4
(5 + 4 * 6 + 3 * 9 + 7) * (7 * 3 * 5) + 6
3 + 4 * (8 + 2) + ((6 * 7) + 8 + 8 * (9 * 3 + 2) * 9)
7 + (7 + 9 * 2 * 9 * 2 * (2 + 5 + 9 * 6)) * 4
(7 + 6 + 3 + 5 * 2) + 2 * 3 + 4 * (3 + 4 * 5 * (3 + 7) + (7 + 2 * 7 * 6) + 8) * 8
4 + (9 * 2 * 6 * (6 + 6 * 7 * 7 + 5) * 9) * 9 + (4 + 8 * 7) * 4 + 4
6 * 6 * 2 + (4 * 2 + 7 + 4 + (2 + 2 * 5)) + 2
8 + 2 + 3 + 3 + 8 + (6 + 4)
8 + 9 + 2 + ((3 * 9 * 3 * 5) * 3 + (2 + 2 + 8 + 6 + 9 + 7)) + 9
6 * (3 * (5 * 4 + 4 * 4 * 4 + 4)) * 8 * (5 + (5 + 2 * 7 + 8) * 3)
3 + ((3 + 7) + 2 + (5 * 3 + 4 * 9))
4 + 5 * 6 * (7 * 5 + 6 * 5 * 5 + (4 * 6 * 9 * 6)) + 7 + 3
7 * 4 * 7 * 5 * (3 + (5 + 6 + 9 * 9 * 3 * 7) * 2 * 8 + 2 + 6)
5 * 4 + (4 * 7 * (3 + 8 + 9)) + 4
(7 + (3 * 5 * 7 + 5 * 8) * (6 + 9 * 6 * 7) * (3 + 9 * 8 + 4) + 8 + 7) * 2 + 4
8 + 7 + (9 + 6 + 7 + 9 + 6 + 4) + (7 * 8 * 6 * 5 * 3) + (3 * 4 * 3 * 8)
7 * ((4 + 4 + 9 + 3 * 3) + (9 * 6 * 8 * 7 * 3 + 6) * 7 + (7 + 2 * 3 + 6 * 2)) + 3 + (5 * 8) + (4 + 9 * 6 * (2 * 5 + 7 * 3 * 5) * 3 * 8)
8 + (3 + (8 + 3 * 4 + 4)) * 2 * 4 * (3 + 4)
(4 + 9 + 4 + (4 + 7 * 3 * 2 * 5 + 7)) * 2
2 * 8
6 * (7 * 5 + (4 * 5 * 2))
(3 + 3 * 4 * 3 + 7 + 4) + 8 + 2 + 4 * 4 * 5
7 * 2 * 5 + (2 * (9 + 6) * (3 * 8 + 4) + 3) * 9
(6 * 9 * (6 + 6 + 7 + 7) * (5 * 7 + 8 * 5 + 2 * 8) + 5 + 8) * 9 * 9 + 3 * 2 + 7
(2 * 3 + 8 + (4 * 2 + 7 * 2 + 7 + 7) + 3 + 6) * 3 * (6 + (9 + 7 * 2 + 2) + 6) + (4 + 3) * 3
4 * (6 * (8 * 8 + 7) + 7) * 6 * 9 * (4 * (6 * 4 * 3 * 2 + 6) + (8 * 9) + (9 + 3) * 4)
5 * 7 * 2 * (2 * 2 * 5 * (8 + 6))
(8 * (7 + 7 + 8)) + 2 + 9 * 9 + 9 * 4
6 + 6 + 5 + (2 * (8 * 7 + 3 * 6) + 9) * 7 + 6
8 + 6 + (8 * 4 * 8 * 2 + (6 * 6 + 9 * 3 + 6)) + 3
9 * 5 * 4 * (5 + (3 + 7) + (4 + 4 * 5 + 5 * 8 * 9) * 5)
5 + 4 * 9 * ((2 * 4 + 8 * 2 * 7 + 2) + 4) * 9 * 3
3 + 6 * (6 + 2 + 3 * 2) + (3 + 5) + ((3 * 6 + 5 + 7 + 8 * 8) * 9 + (5 + 8 * 7 + 6 * 8 + 7) + 7 + 8 + 5)
7 * ((7 + 5 * 3 * 5 + 4) + 7 + (6 * 3 * 6 * 6 * 7 * 7))
((5 + 7 * 9 * 2 + 3) * 2 + 9 * 3) * (4 + 6) * (4 * 7 * (9 + 6 * 8 + 5) * (3 + 8 + 9) + 9 * (8 + 6 * 9 + 6)) * 6 + 4
2 * (6 * 3 + 4 + 4 * 2) + 6 + 7 + 5
2 + 7 + 5 + 5 * ((7 * 6 + 2) * 8 * 8) + (2 * 5 * 4 * 5)
3 + (7 * 8 * 5) + 5 + (5 + (4 * 4 + 7 + 2) + 6 + (8 + 3) * 9 + 4)
6 * (9 + 5 + 6) * 5 + 5 * (7 * (3 * 5 + 6 + 2 * 5) * 2)
(9 + 6 + (9 + 7 * 5 + 6 * 7) * 7 * 3) + 3 + 4 + 6
7 * ((5 + 4 + 6) + 7) + 2 * 3 + (6 + 9 * (6 * 4 * 8 * 3 + 4 * 2) + 7) + 3
7 * (8 + 9 + 5 * (9 * 7 * 9) + 2) + (7 + 7 + (7 + 3 + 2 * 2) + 4 * 2)
3 * (2 * (4 + 6) * 8)
8 + ((6 * 4 * 8 + 4) + 7) * 7
(7 + (2 + 8 * 8 * 6 * 2)) + 7 * 2
(4 * 2 + 4 * 8 + 4) + (3 * 9 + (2 * 4 + 2 * 7) * 9 + 7) * (5 + 9) * (7 + (3 * 4 * 4 * 6) + 8 * 7) + 8 + 8
8 + (2 + 2 * 8 * 7 + 7) + 2 + 4 * 3 + (8 + 9 * 9)
3 + 2 + 8 + (9 + 3 * (3 + 2 + 9 + 7) + 4 * 4 * 7) * 3
5 * 4 * 7 * 3 + (9 * (6 * 6 + 2 * 4) * 8 + 2 * 9)
4 * 7 * (3 + 6 * 6 + 4 + 8) + 5
(8 + (8 + 2 * 9 + 3 * 3) * 8 * 8 * (9 * 6 + 2 * 6)) * 9 + 5 * 2 + 5
5 + 6 + 3 + 4 * 9 + (4 + (4 + 3 + 9 * 2) + 4)
3 * (5 + 3) * 7 + 6
((3 * 2 + 2 * 6 + 5 + 3) + 4) + (4 * (8 + 2 + 9 * 2) * 8 + (8 * 3 + 6 + 2 + 6) * 2) + 7 + 2 * 9
6 * 8 * ((8 * 8 + 3 * 7 + 8 * 4) * 4 + 9) + (8 * 7 * (6 * 8 * 3 * 2) * 3) * 2 * 8
(2 * 7 + 4) * 2 * (5 * 4 + 2 + 5 + (7 + 5) * (4 * 3 + 6 * 8 * 5 + 9)) * 5
(6 * 8) * (7 * 7 + 8 * 3 * 3) * (5 * 8 + 2)
(6 + 6 * 2) * 5 + ((7 * 6 * 8) * 8 * 9 * 4)
(8 * 4 * 9) + ((5 * 3 + 6 * 3) + (9 + 9 + 9 * 2 * 2) * (4 + 9 * 7 + 2 * 2 + 3) + 6) * 7 * 6 * 6
((4 + 3) * (2 * 5 + 8 * 2 * 4) * 9) + 6 + (6 + (5 * 4 * 5 * 3 + 3) * 6 * (5 * 3 + 7 * 2 + 4 + 8)) + 4 + 7
(6 * 9 + 9 + 7) * (6 * 2 * (4 * 7 * 4 + 4 * 5 + 7) + (7 + 5 * 8 * 4 + 9 + 6)) * 7 + 8 * 5 + (9 * 5 * 2 + 7)
6 * 6 + ((2 + 9) * 5 + 2 * 3 + 3 * 3) + 9 * ((4 * 7) + 5 + 8 + 4)
5 + (4 * 5 + 5 * 3 + 7) * 6 * 5 + (2 + (9 + 7 + 8 + 4))
(2 * 4 + 5 + 8 + 6 * 9) + 3 + 6
9 + (9 + 8 * 3) * (3 + 8 + 6 + 5) * 5
(3 + 9 * 5 + 7) + 2
((9 + 5 * 2) * 5 + (4 + 2 * 7) + 9) * 8
(4 + 4) * 9 + 3 + 2 * 8
(3 + 4 * 8 + 9 * 6 + 6) * 5 + 8 + 9
3 * 8 + 9 * (3 * 4)
6 + 7 * 6 * 7
3 * 3 + (8 * 8 * 9 + 3 * 8 + 2) * 3 + 8 * 2
5 + ((6 + 2 * 6) * 8 + 6 * 5) + ((7 + 3) + 2 * 5 + 7 + 6 + 5) + (8 + 2 * 7 + 4 + 2 * 3) * 2 * 5
(6 * (6 * 7) * 7 + 3) * 9 + 6 * 3
(5 * 9 + 7) + 8
(3 + 9 * 3 * 9 * 2) * 9 * 5
5 + (6 * 3)

7
input/day18_example.txt Normal file
View File

@@ -0,0 +1,7 @@
1 + (2 * 3) + (4 * (5 + 6))
1 + 2 * 3 + 4 * 5 + 6
2 * 3 + (4 * 5)
5 + (8 * 3 + 9 + 3 * 4 * 3)
5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))
((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2
6 * ((3 + 4 * 3 * 7 * 8) * 8 + (9 + 5 + 2 * 3) * 3 * 2) + 7 + 8 * 8 + 4

202
src/day18.rs Normal file
View File

@@ -0,0 +1,202 @@
use super::util;
pub fn solve() {
let lines = util::read_file("input/day18.txt");
// lines.iter()
// .for_each(|s| println!("{} = {}", s, evaluate(s.as_str()).0));
let part1: u64 = lines.iter().map(|s| evaluate(s.as_str()).0).sum();
println!("Day X Part 1: {}", part1);
let part2: u64 = lines.iter()
// .inspect(|s| println!("{}: {}", s, build_expression_tree(s.as_str()).0.evaluate()))
.map(|s| build_expression_tree(s.as_str()).0.evaluate())
.sum();
println!("Day X Part 2: {}", part2);
}
fn evaluate(input: &str) -> (u64, usize) {
let mut i = 0usize;
let mut res = 0;
let mut operator = Operator::Add;
while i < input.len() {
let c = &input[i..(i+1)];
if c == "(" {
let sub_evaluation = evaluate(&input[(i + 1)..]);
i += sub_evaluation.1;
res = operator.apply(res, sub_evaluation.0);
} else if c == ")" {
return (res, i + 1);
} else if c == "+" {
operator = Operator::Add;
} else if c == "*" {
operator = Operator::Multiply;
} else if c == " " {
// Nothing to do
} else {
let n = c.parse::<u64>().unwrap();
res = operator.apply(res, n);
}
i += 1;
}
return (res, i);
}
fn build_expression_tree(input: &str) -> (ExpressionTreeNode, usize) {
// println!("Evaluating '{}':", input);
let mut subtrees: Vec<(usize, usize, ExpressionTreeNode)> = Vec::new();
let mut evaluate_until = input.len();
{
let mut i = 0;
// First build subtrees for brackets:
while i < evaluate_until {
let par_open = input[i..evaluate_until].find("(").map(|p| i + p);
let par_close = input[i..evaluate_until].find(")").map(|p| i + p);
if par_open.is_some() && par_close.unwrap() > par_open.unwrap() {
let subtree_start = par_open.unwrap();
let subtree = build_expression_tree(&input[(subtree_start + 1)..]);
let subtree_end = subtree_start + subtree.1 + 1;
subtrees.push((subtree_start, subtree_end, subtree.0));
i = subtree_end + 1;
} else {
if par_close.is_some() {
// If we find a closing parenthesis, we're apparently building a subtree
evaluate_until = par_close.unwrap();
break;
} else {
// No parenthesis, so no need to search further
break;
}
}
}
}
// println!("Subtrees between parentheses in '{}':", &input[0..evaluate_until]);
// subtrees.iter().for_each(|s| println!("{:?}", s));
// Now we're gonna match/find all +:
build_subtrees_for_operators(input, 0, evaluate_until, "+", &Operator::Add, &mut subtrees);
build_subtrees_for_operators(input, 0, evaluate_until, "*", &Operator::Multiply, &mut subtrees);
// // By now we should have a single root node left
// println!("Subtrees in '{}':", &input[0..evaluate_until]);
// subtrees.iter().for_each(|s| println!("{:?}", s));
assert_eq!(subtrees.len(), 1);
return (subtrees.remove(0).2, evaluate_until);
}
fn is_not_whitespace(c: char) -> bool {
return !c.is_whitespace();
}
fn build_subtrees_for_operators(input: &str, from: usize, until: usize, operator_symbol: &str, operator: &Operator, subtrees: &mut Vec<(usize, usize, ExpressionTreeNode)>) {
let mut i = if subtrees.is_empty() || subtrees[0].0 > from { 0 } else { subtrees[0].1 + 1 };
// Subtree index points to the subtree after the current search-range
let mut subtree_idx = if i == 0 { 0 } else { 1 };
let mut search_until = if subtrees.is_empty() { until } else if subtree_idx < subtrees.len() { subtrees[subtree_idx].0 } else { until };
while i < until {
let operator_idx = input[i..search_until].find(operator_symbol).map(|r| i + r);
if operator_idx.is_some() {
// Found the operator symbol, let's build a subtree with whatever is left and right of it:
let subtree_end = build_subtree_for_operator(operator_idx.unwrap(), &input, operator, subtrees);
i = subtree_end + 1;
if i > search_until {
// Our newly build subtree includes the last search range:
search_until = subtrees.iter().map(|s| s.0).find(|s| s > &i).unwrap_or(until);
}
} else {
subtree_idx += 1;
// If the subtree_idx points the to subtree "after" the last one, that just means to search until the end of the string
// If the subtree_idx points even after that, then we're done.
if subtree_idx > subtrees.len() {
break;
}
i = subtrees[subtree_idx - 1].1;
search_until = if subtrees.is_empty() { until } else if subtree_idx < subtrees.len() { subtrees[subtree_idx].0 } else { until };
if i == search_until {
break;
}
}
}
}
fn build_subtree_for_operator(idx: usize, input: &str, op: &Operator, subtrees: &mut Vec<(usize, usize, ExpressionTreeNode)>) -> usize {
let left_idx = input[0..idx].rfind(is_not_whitespace).unwrap();
let right_idx = idx + 1 + input[(idx + 1)..].find(is_not_whitespace).unwrap();
let left_subtree = subtrees.binary_search_by_key(&left_idx, |s| s.1);
let right_subtree = subtrees.binary_search_by_key(&right_idx, |s| s.0);
let subtree_start = if left_subtree.is_ok() { subtrees[left_subtree.unwrap()].0 } else {left_idx};
let subtree_end = if right_subtree.is_ok() { subtrees[right_subtree.unwrap()].1 } else {right_idx};
let subtree = ExpressionTreeNode {
operator: Option::Some(op.clone()),
right: Option::Some(Box::from( if right_subtree.is_ok() { subtrees.remove(right_subtree.unwrap()).2 } else { ExpressionTreeNode::leaf_node(&input[right_idx..(right_idx+ 1)]) })),
left: Option::Some( Box::from(if left_subtree.is_ok() { subtrees.remove(left_subtree.unwrap()).2 } else { ExpressionTreeNode::leaf_node(&input[left_idx..(left_idx + 1)]) })),
num: Option::None,
};
let insertion_index = if subtrees.is_empty() { 0 } else {
let res = subtrees.binary_search_by_key(&subtree_start, |s| s.0);
if res.is_ok() { res.unwrap() } else { res.unwrap_err() }
};
subtrees.insert(insertion_index, (subtree_start, subtree_end, subtree));
return subtree_end;
}
#[derive(Debug, PartialEq, Clone)]
enum Operator {
Multiply, Add
}
impl Operator {
fn apply(&self, x: u64, y: u64) -> u64 {
return match self {
Operator::Add => x + y,
Operator::Multiply => x * y
}
}
}
#[derive(Debug)]
struct ExpressionTreeNode {
operator: Option<Operator>,
num: Option<u64>,
left: Option<Box<ExpressionTreeNode>>,
right: Option<Box<ExpressionTreeNode>>,
}
impl ExpressionTreeNode {
fn leaf_node(input: &str) -> ExpressionTreeNode {
return ExpressionTreeNode {
operator: Option::None,
left: Option::None,
right: Option::None,
num: Option::Some(input.parse::<u64>().unwrap())
};
}
fn evaluate(&self) -> u64 {
return if self.num.is_some() {
self.num.unwrap()
} else {
self.operator.as_ref().unwrap().apply(self.left.as_ref().unwrap().evaluate(), self.right.as_ref().unwrap().evaluate())
}
}
}

3
src/main.rs
View File

@@ -19,6 +19,7 @@ mod day14;
mod day15;
mod day16;
mod day17;
mod day18;
mod day19;
const MAX_DAY: u8 = 19;
@@ -43,7 +44,7 @@ fn solve(day: u8) {
15 => day15::solve(),
16 => day16::solve(),
17 => day17::solve(),
// 18 => day18::solve(),
18 => day18::solve(),
19 => day19::solve(),
_ => println!("This day is not yet implemented")
}