Day 18 use large numeric type to prevent overflow.

This commit is contained in:
Bill Thiede 2020-12-20 10:11:30 -08:00
parent 37fdc75db4
commit 7bfe984659

View File

@ -35,7 +35,7 @@ use aoc_runner_derive::{aoc, aoc_generator};
#[derive(Clone, Copy, Debug, PartialEq)]
enum Token {
Num(u32),
Num(u64),
Add,
Mul,
Open,
@ -43,232 +43,6 @@ enum Token {
Space,
}
#[derive(Debug, PartialEq)]
enum Ast {
Add(Box<Ast>, Box<Ast>),
Mul(Box<Ast>, Box<Ast>),
Num(u32),
}
fn eval(ast: &Ast) -> u32 {
0
}
#[derive(Copy, Clone, Default, PartialEq)]
struct NodeId(usize);
impl fmt::Debug for NodeId {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "NodeId({})", self.0)
}
}
#[derive(Debug, Default)]
struct Node {
parent: Option<NodeId>,
data: Option<Token>,
left: Option<NodeId>,
right: Option<NodeId>,
}
impl Node {
fn set_left_child(&mut self, id: Option<NodeId>) -> Option<NodeId> {
let old = self.left;
self.left = id;
old
}
fn set_right_child(&mut self, id: Option<NodeId>) -> Option<NodeId> {
let old = self.right;
self.right = id;
old
}
}
#[derive(Debug)]
struct Tree {
nodes: Vec<Node>,
root: NodeId,
}
use std::fmt;
impl fmt::Display for Tree {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fn print_node(f: &mut fmt::Formatter<'_>, tree: &Tree, id: NodeId) -> fmt::Result {
//dbg!(id, tree.get_node(id));
match tree.get_node(id).data {
None => (),
Some(Token::Num(n)) => write!(f, "{}", n)?,
Some(Token::Add) => {
print_node(f, tree, tree.get_node(id).left.unwrap())?;
write!(f, "+",)?;
print_node(f, tree, tree.get_node(id).right.unwrap())?;
}
Some(Token::Mul) => {
print_node(f, tree, tree.get_node(id).left.unwrap())?;
write!(f, "*",)?;
print_node(f, tree, tree.get_node(id).right.unwrap())?;
}
Some(Token::Open) => {
write!(f, "(",)?;
}
Some(Token::Close) => {
write!(f, ")",)?;
}
Some(Token::Space) => {
write!(f, " ",)?;
}
};
Ok(())
}
print_node(f, self, self.root)
}
}
impl Default for Tree {
fn default() -> Tree {
Tree {
nodes: vec![Node::default()],
root: NodeId(0),
}
}
}
impl Tree {
fn get_node(&self, id: NodeId) -> &Node {
&self.nodes[id.0]
}
fn get_node_mut(&mut self, id: NodeId) -> &mut Node {
&mut self.nodes[id.0]
}
fn add_node(&mut self, n: Node) -> NodeId {
self.nodes.push(n);
NodeId(self.nodes.len() - 1)
}
}
#[derive(Debug, Default)]
struct Parser {
tree: Tree,
cur: NodeId,
debug_tokens: Vec<Token>,
}
impl Parser {
fn add_left_child_cur(&mut self, mut n: Node) -> NodeId {
n.parent = Some(self.cur);
let id = self.tree.add_node(n);
self.cur_node_mut().left = Some(id);
id
}
fn add_right_child_cur(&mut self, mut n: Node) -> NodeId {
n.parent = Some(self.cur);
let id = self.tree.add_node(n);
self.cur_node_mut().right = Some(id);
id
}
fn cur_node_mut(&mut self) -> &mut Node {
self.tree.get_node_mut(self.cur)
}
fn cur_node(&self) -> &Node {
self.tree.get_node(self.cur)
}
fn set_cur_data(&mut self, t: &Token) {
let cur = self.cur_node();
let cur_id = self.cur;
if cur.data.is_some() {
match cur.right {
Some(node) => {
// Create a new node, stick it in `right` and reparent the previous node.
let id = self.tree.add_node(Node {
parent: Some(self.cur),
..Node::default()
});
self.set_cur_node(id);
self.tree.get_node_mut(cur_id).right = Some(id);
self.cur_node_mut().left = Some(node);
}
None => {
let id = self.add_right_child_cur(Node::default());
self.set_cur_node(id);
}
};
}
self.cur_node_mut().data = Some(*t);
}
fn set_cur_node(&mut self, id: NodeId) {
assert_ne!(Some(self.cur), self.cur_node().parent);
self.cur = id;
}
fn set_cur_to_parent(&mut self) {
match self.cur_node().parent {
Some(parent) => self.set_cur_node(parent),
None => {
let id = self.tree.add_node(Node::default());
self.cur_node_mut().parent = Some(id);
let old_id = self.cur;
self.tree.root = id;
self.set_cur_node(id);
self.cur_node_mut().left = Some(old_id);
}
}
}
fn add_token(&mut self, t: &Token) {
//TODO(wathiede): we seem to be building the tree backwards so that walking the tree works
// right-to-left instead of left-to-right.
self.debug_tokens.push(*t);
match t {
Token::Num(_) => {
self.set_cur_data(t);
self.set_cur_to_parent();
}
Token::Add => {
self.set_cur_data(t);
let id = self.add_right_child_cur(Node::default());
self.cur = id;
}
Token::Mul => {
//dbg!(&self);
self.set_cur_data(t);
let id = self.add_right_child_cur(Node::default());
self.cur = id;
}
Token::Open => {
let id = self.add_left_child_cur(Node::default());
self.cur = id;
}
Token::Close => self.set_cur_to_parent(),
Token::Space => unreachable!("spaces should be filtered"),
};
}
fn eval(&self) -> u32 {
dbg!(&self.debug_tokens);
dbg!(format!("{}", self.tree));
fn eval_inner(tree: &Tree, id: NodeId) -> u32 {
match tree.get_node(id).data {
None => panic!("empty node"),
Some(Token::Num(n)) => n,
Some(Token::Add) => {
let l = eval_inner(tree, tree.get_node(id).left.unwrap());
let r = eval_inner(tree, tree.get_node(id).right.unwrap());
dbg!(l, r);
dbg!(l + r)
}
Some(Token::Mul) => {
let l = eval_inner(tree, tree.get_node(id).left.unwrap());
let r = eval_inner(tree, tree.get_node(id).right.unwrap());
dbg!(l, r);
dbg!(l * r)
}
Some(Token::Open) => panic!("("),
Some(Token::Close) => panic!(")"),
Some(Token::Space) => panic!(" "),
}
}
eval_inner(&self.tree, self.tree.root)
}
}
#[aoc_generator(day18)]
fn generator(input: &str) -> Vec<Vec<Token>> {
input.split('\n').map(lex).collect()
@ -283,7 +57,7 @@ fn lex(input: &str) -> Vec<Token> {
b'+' => Token::Add,
b'*' => Token::Mul,
b' ' => Token::Space,
c @ b'0'..=b'9' => Token::Num((c - b'0') as u32),
c @ b'0'..=b'9' => Token::Num((c - b'0') as u64),
c => panic!(format!("unexpected char '{:?}'", c)),
})
// Ignore spaces
@ -291,15 +65,74 @@ fn lex(input: &str) -> Vec<Token> {
.collect()
}
fn parse(tokens: &[Token]) -> u32 {
fn parse(tokens: &[Token]) -> u64 {
/*
let mut p = Parser::default();
dbg!(&p);
tokens.into_iter().for_each(|t| p.add_token(t));
p.eval()
*/
let mut stack = vec![Vec::new()];
let mut cur_stack = 0;
tokens.iter().for_each(|t| {
match t {
Token::Num(n) => match stack[cur_stack].last() {
Some(Token::Add) => {
stack[cur_stack].pop();
if let Some(Token::Num(left)) = stack[cur_stack].pop() {
stack[cur_stack].push(Token::Num(left + n));
}
}
Some(Token::Mul) => {
stack[cur_stack].pop();
if let Some(Token::Num(left)) = stack[cur_stack].pop() {
stack[cur_stack].push(Token::Num(left * n));
}
}
None => stack[cur_stack].push(*t),
c => {
dbg!(&c);
}
},
Token::Add => stack[cur_stack].push(*t),
Token::Mul => stack[cur_stack].push(*t),
Token::Open => {
stack.push(vec![]);
cur_stack += 1;
}
Token::Close => {
// Take the result of this parenthetical group and push it on to the stack one
// level below.
assert_eq!(stack[cur_stack].len(), 1);
let t = stack[cur_stack].pop().unwrap();
stack.pop();
cur_stack -= 1;
stack[cur_stack].push(t);
// If the stack has 3 things, it was waiting for this result.
let len = stack[cur_stack].len();
if len >= 3 {
let s = &mut stack[cur_stack];
match (s.pop(), s.pop(), s.pop()) {
(Some(Token::Num(right)), Some(op), Some(Token::Num(left))) => match op {
Token::Add => stack[cur_stack].push(Token::Num(left + right)),
Token::Mul => stack[cur_stack].push(Token::Num(left * right)),
d => panic!(format!("unexpected op {:?}", d)),
},
d => panic!(format!("unexpected trio from on stack: {:?}", d)),
}
}
}
Token::Space => unreachable!("no space should be present"),
};
});
match stack[cur_stack].last() {
Some(Token::Num(n)) => *n,
d => panic!(format!("Unexpected stack contents: {:?}", d)),
}
}
#[aoc(day18, part1)]
fn solution1(tokens_list: &[Vec<Token>]) -> u32 {
fn solution1(tokens_list: &[Vec<Token>]) -> u64 {
tokens_list.iter().map(|tokens| parse(tokens)).sum()
}
@ -325,15 +158,415 @@ mod tests {
#[test]
fn part1() {
// 1106240272 too low
for (input, want) in vec![
("1 + 2 * 3", 9),
("(1 + 2) * 3", 9),
("((1 + 2) * 3)", 9),
("1 + (2 * 3)", 7),
("(1 + (2 * 3))", 7),
("1 + 2 * 3 + 4 * 5 + 6", 71),
("(1 + 2 * 3 + 4 * 5 + 6)", 71),
("2 * 3 + (4 * 5)", 26),
("5 + (8 * 3 + 9 + 3 * 4 * 3)", 437),
("5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))", 12240),
("((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2", 13632),
("((9 * 7 + 6 + 7 * 9 + 2) * 4 + 3 + 4 + 4 * 6) * 8 + (4 + (8 + 2 * 6 * 4 * 3)) + (5 + 2 * 6 * (4 * 5 + 4 + 2)) + 4 * (6 + 3 * (2 * 2 * 6 * 3) + 8 + 4 * 5)", 1740572064000),
] {
dbg!(&input);
assert_eq!(parse(&lex(input)), want, "{}", input);
let got = parse(&lex(input));
eprintln!("got {}, want {} for {}", got, want, input);
assert_eq!(got, want, "got {}, want {} for {}", got, want, input);
}
let input = r#"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"#;
assert_eq!(solution1(&generator(input)), 71 + 26 + 437 + 12240 + 13632);
}
#[test]
fn comprehensive() {
let mut ts = vec![
("(7 * (3 + 8 + 8 + 7) + (6 + 8 * 2 + 5 + 2 * 6) * (5 + 2) * 9) + ((7 * 4 + 8) * 6 * 8 + 9) * 7 * 2 * 2", 9896040),
("6 * ((9 + 4) * (6 * 7 + 5 + 8 * 2))", 18720),
("7 * 8 + 2 + 8 * (8 * 4) * (4 + 8)", 48384),
("(9 + 3 + 2 * 5 * 8) + 9 + 5 * 2 * 5 * (6 * 6 * 4 + 6 * 9 * 3)", 55792800),
("6 * 6 * 4 * (6 + (3 * 9 * 2) + 9 + (4 + 7 + 7))", 12528),
("7 * ((4 * 6 + 4 + 6 * 8 + 6) + (2 * 7 * 8 + 5 * 3 + 7) + (5 * 5 * 5 * 7) + 8 * 7)", 176351),
("(8 + 9 * 7 * 9 + 6) + (7 + 5) + 6", 1803),
("5 * (6 * (3 + 2 + 9)) + 8 + 3 + 5 * (4 + 3 * 8 * 8 * 6 * 2)", 2688000),
("4 + (3 + 4 * (4 + 9 + 3) * (4 * 8 * 4 * 9))", 129028),
("4 * 4 * 6 * 2 + ((8 * 4 * 3 + 6) * 5) + 6", 139008),
("(8 * (8 + 5 + 5 * 7) * 9 + 2 + 9) * 4 + 9 * ((3 + 3) + 8) + 9", 6027840),
("((9 + 8 * 3 + 2 + 9 + 8) * 3 + (3 + 7 * 6) * 9 * 2) + 3 * 7", 2968833),
("5 + 5 * (5 * (6 + 6 + 6 + 7) * 7 + (9 * 4) * 4 * (8 * 9))", 15480000),
("7 * (2 * 7 + 3 + 5 + 5 * 2) + 4 + 3 * 3 + 5", 4872),
("(4 + 5 * (2 * 4 + 5 * 2 * 7 + 5) + 2 + 9) + 4 + 9 * 9 * 3", 108000),
("7 * 6 + (6 * 2 + 4 + 5 * 8) + (6 * 2 * (4 * 7 * 2) + 9 * (5 * 2 * 4) + (3 + 2 * 5)) * 8", 2869104),
("2 + ((9 * 3 * 3 * 3) * (5 * 9 + 6 + 7 + 6 + 8) * 3)", 131222),
("7 * ((9 + 7 + 4 * 3 * 4 + 4) + 4 * 3) * 5 * 3 * 7", 1067220),
("8 * (3 + 5 * 9 + 4) * 6 + 4", 8320),
("7 + 6 * 7 * ((7 * 6 * 2) * 3) * 5 * 7", 802620),
("8 + 5 * 4 * (3 + 5 * (8 + 5 * 2) + 6) + 6", 13624),
("4 * 8 + ((3 * 5 * 4) + 7) + (4 * 2)", 332),
("((5 + 8 + 7 + 6 * 6 + 3) + 4 * 3 * (5 * 2) * 5 * (2 * 9)) + 6 + 3 * (2 * (2 + 4 + 8) * 4) + (9 + 3 + 6 * (9 + 5 * 6 * 3 * 8 * 5) + (4 * 6) + (6 * 3 + 2 + 8))", 117846779292),
("(3 + 4 + 8) + 6 * (7 * 6 * (9 * 3 * 5 * 5 * 4 * 5) + (6 + 4) * (5 * 2 * 3 + 3) + (2 * 7)) + 2 * 4", 3527082888),
("6 * (6 * 9 * (3 * 9) * 4 + 9) + 6", 113760),
("4 + 6 * 7 * ((3 + 5 + 3) * (6 + 3 * 9 + 6 * 8 * 9) + 6 * 4) * 8", 239648640),
("5 + (6 + 9 * (7 * 8 * 8 * 3 * 4) + 2) * 4 * 2", 645400),
("(2 * 7 * 6 + 9 + (3 * 6 + 4 * 7 + 5) + 8) + 7 + 7 * 8", 43008),
("2 + (6 + 4 + (5 + 5) * 7) * 2 + 7 * 5", 6390),
("4 + 9 * 3 + 8 * 6", 858),
("(5 + 5 + 9 * 8 * (4 * 5 + 6 + 3 * 8 * 3) + 6) + 9 + 9", 205218),
("(8 * 4 * 7 + 9 + 6 * 9) * (9 + 2 * 2) + 3", 158400),
("((9 * 4 + 8 + 4 * 2 + 2) * 3 + (6 + 9 * 5 * 4) * 4 + 6 * 5) * 5 * 3 * 5 + (3 + 5 * 4)", 4843152000),
("5 + (5 * 3) * (2 + 8) * (3 + 6 + 4 * 6 + 7 + 7) * 5 * 7", 1820000),
("6 * 6 * 7 * (5 * 4 + 2 + 6 + (8 + 6 + 4 + 9 * 5))", 185220),
("2 * 9 + (2 * (8 * 7 + 6 + 5 + 3) + 2 + 9 * (3 * 9 * 4 * 7 * 7 + 5) + 3) + (4 + 6 * 4 + 6)", 6497918),
("(9 + (8 * 8 + 2 + 2 * 6 + 6)) * 8 + 4 + 3 + (9 + 3 + 9 + 9 * 4 * 8) * 2", 2263950),
("8 * 4 * (4 * (3 + 7 * 7 + 3) + 8 * (5 + 2 + 3) * 2) + 9", 276768),
("5 + (6 * (3 * 3 + 7 * 3) * (4 * 4) + 2 * 4 * 4)", 155525),
("3 + (5 * 8 * 9 * 3 + 9 * (6 * 7)) * 9 + 3", 2177316),
("3 * (9 * 3 + (5 + 4 * 7 + 3 + 8)) + 4 * 2 * 3", 26802),
("8 * 9 + 6 + (7 + 7 + 9 * 8 * 5 * 6) * 5", 221400),
("(8 + 9 + 3 + 7 * 7) + 2 + 9 + (8 + 7 + 4 + 2) + 9", 230),
("4 * (2 * (7 * 4 + 2 + 9 + 6 + 7) + (4 + 2) * 3 + 9 + 6) + 6 * 4 + 7 * 5", 1601160),
("(3 * 4 + (5 * 8 * 2) * (7 + 8)) + 7 + 8 + 5 + ((6 * 9) * 4 * 5)", 4880),
("4 + ((9 + 9) + (7 * 8 + 2 * 8 * 2) + 9) + 2 + 7 * 2", 2320),
("8 * 3 * (9 + 5 + 8 + 5)", 648),
("4 + 4 + (6 + 2 * 7 + 9 + 6 * 5)", 888),
("((8 + 3 * 8 * 2) + 7 + 7 * (7 * 7 * 7 + 3) * 9 * (9 * 4 + 7)) + 4 + 6", 82952110),
("6 + (7 * 2 + 4 + 5 + 4) + 9 + ((7 * 9) * 7) * 5", 2805),
("(7 * 3 * 2) * ((9 + 6 * 2 * 6 * 3) + (6 * 7) + 3 + (6 + 5 * 5 + 4 + 9 * 6) * 4 + 9) + 4 + 7 + 6", 968772),
("9 * (3 * (9 + 8)) * 4", 1836),
("6 * (4 * 2 * (9 * 5 * 4 + 7 + 9) + 6 + (3 + 6 * 2)) * 5 * (3 * (2 + 6 * 8 * 6 + 3 + 7) * 8 * 7 * (9 * 8 * 7 + 7 + 9) * 7) + 3 + 6", 442232672777280),
("7 + 3 * ((6 * 3 * 9) + 3 * 9)", 14850),
("7 * ((4 + 4 * 4 * 9 * 7) + 2 * 9) * 8 * 6 * 6 + 3", 54921888),
("6 + 5 + (5 + 3 * (3 + 7 + 9 * 3) * 6) + 3 + ((2 * 3 * 4 + 4) * 6 + (3 + 3) + 2)", 3422),
("9 + ((8 * 9 * 3 * 2) * 5 + 8)", 5625),
("(2 + 7) * 3 * (8 + 5) + 9", 594),
("4 * (5 + 4 + 6 * (9 * 4 + 8 * 4 * 7 * 3) * (4 * 4 * 6) * (9 + 7 + 8 * 4)) * (4 + 4 + 9 + 8) + 7 * 8 + 5", 2086844497920),
("((7 * 4 * 4 * 3) * 4 + 2 * 2 + 2) * 9 + 9 * 8 + 9", 2467584),
("4 + 6 + 2 * (5 + 3 + 8 * 4)", 768),
("((7 + 6) + 3 * 3 * 5) * ((9 * 3 + 5 + 8) + (3 + 8 * 8 + 7 + 5 * 6) + 2 * 5 + (7 + 9 + 2)) + (4 * 2 * (5 + 8 + 5 + 3) * 5 + 6 * 2) + 6 * 5 * (2 * (9 + 4) * (7 * 8) * 8 + 7)", 980703360000),
("6 + 5 + 5 + 2 * 5", 90),
("5 + 5 + 8 * 8 + 2 + 6", 288),
("(3 * (4 * 6 * 8 * 2)) + 3", 1155),
("(5 + 6 * 3 + 5 * 2) * 5 * (3 * 5 + 2 * 7 * 9 * 3) + 5 * ((6 + 2 * 7 + 2 + 4 + 2) * 9 + 6) + 7", 6319295840),
("(7 + 7 * 4 * 7) * ((8 * 5 * 9) + 6 * 9 + 3 * 3 * 9) * 8 * ((3 * 5 * 2 + 6 + 5) * 7 + (6 * 2 * 7 * 7) + 8 + 8 + 6)", 44742672898560),
("(3 * 6 + 7 + 6 + 3 + 7) * 4 * 7 * ((9 + 3 + 6) * 5 + 3 + (5 * 7 + 4 + 5 * 2) + 5) * 5 * 9", 341356680),
("7 * ((7 + 6 + 2 + 9) + 3 * 4 + 9 + 2 + 2) + 2", 3227),
("3 * 8 * 2 * (6 * 2 * 2 + 4 * 8) + 8 + 7", 28368),
("8 + 3 + ((4 * 6 * 5 * 7) * 9 + 9 + 8 * 4)", 87371),
("(6 + 4 + (6 + 3 + 3 + 3) + 6) * 9", 279),
("2 * 6 * (5 + 2) * (6 * 6 + 7 + 2)", 7560),
("4 + (8 + 2 + 4) * 4 * 5 + (9 * 5 + 9) + 8", 10008),
("6 * 3 * 9 + 6 + (2 * 4 * 3 + 2 * 5 * 3) * 6", 66420),
("2 + (8 + 5 * 7 + 4 + 7 * (2 + 9 * 6 * 5 * 3 + 3)) + 9 * 4", 1853324),
("(9 + (2 + 6 + 7 * 4 * 8) + 9 * 4 + 9) * 3 + 8 * 8", 569712),
("2 * (9 * 5 * 9 + (8 * 9 + 5)) * 8 * 8", 696960),
("3 + 6 + 2 * 3 * 9 + 9", 594),
("8 * 7 + 8 * (5 + 6) * 5 + 4", 11880),
("4 * (6 * 2 * (3 + 6 * 3) + 7 * 5 + 6)", 17952),
("(7 * 3 * 7 * 4 * 3 * 2) * (9 + 8 * 9) + 9 * (4 * 5 + 3 + 5 + 9)", 50295168),
("9 + 8 * 3 * 4 + (9 + 8 * 9) + (4 * (6 * 4 * 9 * 5 + 6 + 4) + 8 + 7 + (4 * 9))", 679371),
("2 * (4 * (3 + 4 + 8 + 5) * 8 * 6)", 7680),
("8 * (8 * 2 * 6 + 6 + 6) * 8", 18432),
("(9 + 3 * 4 * 9 + 5 * 5) * 4", 13440),
("(9 * 9 * 4 * 4 + (6 * 2) + (3 + 3 * 2)) + 3 + ((2 * 3 + 8 * 4 * 8 * 2) + 2 + 3)", 10488),
("7 * (9 * (6 + 3 + 7)) * ((8 + 3 + 3 * 3 + 3 + 7) + 4 + 5 + 3 * (6 * 4 * 6 * 6 + 2 * 5) + (2 + 3 + 9 + 3 * 6 + 4)) + 6", 1159629408),
("8 + 6 * (3 + 5 + 6 + 9) * 4", 1288),
("(6 + 7 + 7 + 7 * 6 + 5) + 3 * 5 * 4 * 5 * 6", 180000),
("(2 * 9 + 9 + 3 * 7 + 6) + 3 + 7 + 4 + 9", 569),
("(7 + (8 * 7 * 4 * 7 * 2 + 4) + (5 + 2 * 2 + 2 * 2 * 6)) * 3 * 4 + (4 * 2 + 4 * 6 + 3 * (8 * 6 + 4 * 3 * 7)) * 6", 63692673912),
("2 * (3 * (5 * 7 * 8 * 7 + 8) + (6 * 3 + 5) + 5 + 9)", 25572),
("8 * 4 + ((7 + 2 + 8) + (2 * 8 * 4 * 4 + 4 * 7) * 2) * 5 * 4", 1152960),
("2 * 6 * 2", 24),
("2 + (2 + 6 * 5 * 9) + ((8 + 2 * 6 * 5 * 5) * 7 + 3) + 3", 15365),
("((9 + 4 + 6 * 3 + 9) * 5) * (7 * 2 * 7 * 5 * 2) + 7 + 9 + 7", 1143420),
("2 + 2 * 8 + 8", 64),
("4 + 6 + 4 * 7", 98),
("4 + 5 + 5 * 8 * (8 + 4 + (2 * 8 + 9 * 9 + 4 + 5))", 69888),
("(7 + 2 + (8 * 4 * 2 + 9 * 6) * 4) * 2 + (9 * 2 * 8 * 9 * 4)", 43998024),
("4 + 9 + 6 * (4 * 6) + 7", 589),
("6 + 4 + 8 * (7 * 9 + 7)", 2016),
("3 * 2 + 2 + 9 + (2 * 9 * 2 * 8 * 2 * (2 + 8 + 9 * 9 + 7)) * 7", 3677457),
("9 + 9 + 5", 23),
("(2 + 3 * 3) + 7", 22),
("(9 * 7 + (8 + 8 * 6) + 2 * 7 * 3) + 6 * (5 * (2 + 9 + 9 + 6) + 6) * 8 * (4 + 4 * 6 * 5 + 5) * 8", 97571635200),
("7 + 4 + (4 * 2 + (2 * 7 + 2 + 4 + 2 + 5) + 9 * (9 * 7 + 7)) + 9 + 7 + (8 + 9 * 7 + 2 + (7 * 8 * 5 * 4 + 6 + 8))", 111564),
("(8 * 3) * (9 + 2 * 7 * 7 + 7) * 6 * 8 + 8 + (9 + 9 + 3 * 5 + 3)", 28562688),
("4 * 5 + 2 + 4", 44),
("((7 + 3 * 8 + 3) * 8 + 4 + 4 * 4 + 8) * 5 + 9 * (3 * 9 + 8 * 7 * 9 * 4) + 7", 3802149120),
("(8 + 6 + 7 + 9) + 8 * 6 * (5 + 2 + 3) * 8", 18240),
("(9 * 8 * (6 * 5) + 9) + 4 + 8 + 8 * 8", 22624),
("(4 + 5 * 9) * 7 + 7 * 6 + 8 * (2 + 5 * 8)", 889056),
("(4 + 3 + (6 + 2 + 2 + 6 * 6 * 2) * 4 * 2 * 9) + 3", 14331),
("8 * (5 + 8 + 2 * 7) + 2 + ((5 * 6 + 4 + 7 + 6 * 5) * 7 * 3 + 8)", 355056),
("2 + 5 + (6 * 3 + 2) + 8", 45),
("2 + 9 * 6 * 5 + 5", 660),
("3 * 3 + 7", 30),
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("7 + 5 * (3 + 8 + 6 * 9 + 5 * 8) * ((9 * 9 * 4 * 9 + 3) * (6 + 9 * 5) * 8 + 4 + 6)", 119924582400),
("7 + 8 * ((3 + 7 * 5) + 3 * 2 + 2 * 3 + 7) * 9 + 8 * 7", 3784200),
("3 + 4 + (5 * (9 + 9 + 3 * 6 * 4 * 3) * 4) * (4 * (7 * 6 * 3 + 5 * 2 * 9) + (7 * 3 + 5))", 738510752),
("3 * (2 + 8 + 2) * 6 * (4 * 4)", 3456),
("2 + 2 + 3 * 5 + (3 + (6 + 2) + 9 + 7) * (3 * 3 + 5 + 8 + 7)", 15456),
("4 + 5 + 6 * 6 * 6 + (3 * 2 * 3 * (2 * 6 + 9) + 6 + (5 + 2 + 9 * 6))", 214380),
("((4 + 9) + 2) * 7 + 3 * 4", 600),
("2 + 6 * ((2 * 7 * 8 * 3 + 8 + 4) + 9 + 6 + 9 * 2 + 9) + 7 * 6", 900048),
("9 * 7 + ((2 + 5 * 2 * 7 * 8) + 6 * 2 + 3 + 4) * 5 * (5 + 2 * 7) * 8", 125543880),
("4 * (8 + 5 * 6 * 8) + 2 + 3 * 7", 17612),
("(2 * 2) * 9 * 6 * 3 + 9", 2592),
("9 + 2 * (7 + 5 + 7 + (3 + 7 * 2 * 2 + 3) * 3)", 3927),
("(2 + 5 * 9) * (4 * (9 + 2 * 4 + 3 + 2) * 2 + 8 + (6 * 7 + 9 + 5)) * 3 + 8", 37322208),
("(6 * (6 + 7 * 7) + 7 * 6 * 7) + ((7 * 6 * 4) * 6 * (8 + 8 + 5 * 7 * 8 + 8) + (4 + 5 * 5 + 5 + 3 * 9) + 8)", 3465000),
("9 * (6 * 9 * (8 * 2 * 6) + 4 * 4)", 194400),
("(5 + 5 * 5 + 8) * 6 + 5 * 2", 2860),
("4 + ((8 + 7) + 5) + 6", 30),
("9 + 6 * (7 + 4 + (9 + 4 + 2 + 8)) + (8 * 5)", 1110),
("(3 * 8 + (6 + 9 * 8 + 6)) + 3 + 4 * 8 + 5 * 3", 25779),
("3 + 6 * (7 * 8 * 6 * (5 + 8 + 6) + 5 * 4) * ((8 + 9 + 6 * 8) * 9 + 6 * 6 + 2 * 2) * 4", 51279298560),
("7 * (6 * (5 * 5 + 9 * 7 + 5 + 9) + 8 + 9 + 2 * (6 * 7 * 7)) * 3", 55158516),
("4 + 2 * (5 * (3 * 8 * 3) * (5 + 9 + 8 * 9) + 9 + 7) * 7 + 5", 5546880),
("6 * 5 * (5 * 3 * 9 * 4 * 2) * 9 + 7 * 4", 2073600),
("3 * (4 * (7 + 2) + 4 + 6 + (3 + 6 + 6 * 5)) + 5", 1143),
("7 * 7 * (5 + 9 + 9) * (8 * 6 * 5 + 4 * 2)", 973728),
("6 + (9 * 4) * ((4 * 2 * 4 * 4 * 6 * 7) + 9 + (2 * 9 + 9 + 9)) + 2 + 4 + 4", 228858),
("9 * (6 * 5 + 9 * 2 * 4) + 7 + 8 * 8 + 9", 105111),
("(6 + 7 + 8 * 2 * 4) * 5 + 2 + 2 * 5 + 6", 16632),
("8 * 7 * (9 * 2 * 4 + 3 + 4 * 4) + (8 * 8 + 9 + 6) + ((7 * 7 + 2 * 9) * (2 * 8 + 2) * 6 * 6) + 8", 22916544),
];
// Find shortest failures first, that should make it easier to understand.
ts.sort_by(|l, r| l.0.len().cmp(&r.0.len()));
for (input, want) in ts {
let got = parse(&lex(input));
eprintln!("got {}, want {} for {}", got, want, input);
assert_eq!(got, want, "got {}, want {} for {}", got, want, input);
}
}
}