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Adam Kramer
dd3d582b58 adding input 2020-12-18 14:04:36 -08:00
Adam Kramer
94a85094bc Implemented 18 part 1 
=
 2020-12-18 14:04:28 -08:00
4 changed files with 619 additions and 1 deletions
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(4 * 6 + 7 * 6 * 4 * 8) + 4 + (2 + 6) * 9 * (2 * 3 * 5 + 7) * 2
6 + (4 + (2 * 9 + 9 * 5 * 6 * 3)) * 6 * 8
(8 * 2) * (7 + 7 + (4 * 2 * 2)) * 8 + 4 + 7 * (2 * 2 * (2 + 6))
4 + 7 + 9 * (3 + 6 * 8 + 3 * 4 + 2) + 9
8 * 8 * 7 * 5 * 3 * 6
8 * (2 + 6) * (8 * 7 + (7 * 5 + 5 * 4) * 5 + 5 + 5) + ((7 * 8 + 2 * 3) + 8 + 4 * 4 + 3) * 9
(2 + 7 * 4 + 9 * (6 + 9) * 9) + 2 * 4 * 8
(6 * 5 * 6 + 3) * 4 * 3 * 3
3 * (3 * (3 * 3 + 5 + 4 + 7 + 8) + 9 * 9) * 4 + 4 * (9 * 8)
7 + 5
((6 * 7) * 8 * 5 + 3) + 8 * 8 * 6 * 7 * 8
(9 + 4) * 4 * (7 + 6 * 2 * 7) * 9 * 2
6 + 5 + (5 * 5) + (3 + 3)
5 + 6 + (9 + 3 * (3 + 9 * 4 * 2 * 9)) * 2 + (9 + 7 + 8) * 4
8 + 2 + (7 * 4 + 8 + (3 + 2 + 2 * 4 * 9) * 4)
6 + ((8 * 6 + 5) * 8 + 9 * 3 + 5) * 6 + 9
(5 * (8 * 6 * 3 + 8 * 7) * 2 + 2 + 2) + (6 * 5) * 7 * 5 + 8
(7 + 9 * 6 * 5 * 2 * 3) + 9 * (2 * 2 + 6 * 5 * 5 + 8) + 8 * 8 * 4
5 * 9 * (6 * 4 * 3 * 7) * 5 + 9 + 5
7 + 7 + (6 * (8 + 2 * 7 * 9 + 4) + (8 + 9 * 5 + 3 + 9 * 4) + 4) * 9 + 8 * (5 + 5 + 9)
((9 * 2 * 5 * 7 + 8 + 7) * (6 * 8 + 3 + 5 * 6 + 4) + (3 + 2 * 6 + 7 * 7 * 9) * 5) + (6 + 4)
7 + 2 + 8 + (6 * 8 + 7) * 2
9 + (3 * 6) + (3 + 8)
3 * 3
4 + (2 + 4)
2 + 8 * 4
4 * 5 * (5 * 7 * 6 * (3 + 5 + 6 + 5)) * (8 + 7 + 5 * (2 * 6 + 9 * 5) * 2 + 8)
6 + 6 * 2 + ((9 + 6 + 2 + 5 + 7) * 8 + 2 + 2 + 3) * 4
3 + 6 * 8
5 * 3 + 6 + 8 * ((6 * 4) + 4 * 6 + (4 + 5 + 4) + 3 + (7 + 2 * 8)) * (6 + 2 * 4)
3 + 3 * 2 * 2 * 2 * ((5 * 5 * 9 + 5 * 3) + 4 + 5 * 9 * 6)
(7 * 6 + 6) * (5 + 4 * 6 * 8)
4 + 7 + (4 + 5 + 7 * 6) * 3
8 * ((5 * 6 * 5 + 9 + 3) + 6 + (4 * 8 + 7 + 5 + 7) + 6 * 5 + (4 + 9 * 5 + 2))
(9 + 5 + 6 * 7 * 4) + 8 * 3 + 4 * 7
(2 * 2 * 4 + 4 * 4 * 5) * 3 + 6 * 3 * 4 + ((8 + 2) + 4 + 6 * 2)
(9 + 4 + 9) + 7 * 9 * 6
7 * 3 + (9 * 2 + (2 * 6 * 8 + 3 * 2) * 5 * 5 + 7)
8 + 7 * 6 + 3 * ((6 * 6 + 3) * 3 + 5 * 5 * 8) * 7
3 + 6 + ((2 + 5 + 7) + 5 * 2 + 9) * 7 * 2
2 + 3 * 3 * ((9 + 3 * 3) + 7 * (3 * 4 * 7) * 8 * 9) * 3
8 + 7 * 2 * 2 * 3 * (8 * 5 + 8 * 2 * (7 + 2 + 3) * 7)
8 + 4 + 8 + ((3 + 7) * (5 + 9 + 9 + 5 + 7) + 6 * 4 * 7)
((7 + 8 + 3 * 9) * 9 * 4 * 4 + 8 * 8) + 2 * 6 * 6 + ((8 * 9) + 2 + 9)
5 + ((8 * 2 * 5 + 4 + 8) * 9 + 6) + (2 * 5 + 3 * 9 * (2 * 5 * 5)) + 2 * 5
2 * ((2 * 5 * 8 + 9 * 6 * 4) * 5 + 5 * 6 * 2) * (9 + 6 + 9) * (5 + 3 + 5 + (8 + 9) * (6 + 3 + 2 * 6 * 3)) * 9
5 + 5 + (4 * 5) + ((3 * 8 + 8 * 6 * 2 * 4) + 3 + 9 + 5 + 2) * 2
(9 + 9 + (3 * 6 + 6 * 2) * 9 + 4) * (7 * 4 + 3) * 4 + 3 + 9
4 + (7 * 2 + (5 * 3 + 9 * 7) + 8 * 9 * 7)
6 + ((7 * 9) * 9 * 3 * 6 + (7 * 8 * 7)) + (9 * 9 * 5) * ((6 + 6 + 4) + 4 + 5 * 7) + ((2 * 9 * 9 * 9 + 3 + 5) * (6 + 2) * (6 + 5 + 9) + 2) * 6
7 * 9 + 2 + ((2 + 5 + 5) * 4) * 9 + 3
9 + 5 + 5 * (8 + 7 * 7) + (7 + 8 * 9 + 4 + (8 + 8)) * (3 + (2 + 4 + 5) * (3 + 7 * 5 + 7 + 2 * 6))
4 * 2 * (7 * 6) + 3
(3 * (6 + 4 * 6 * 8) + (2 + 4 + 8 * 5) + 3 * 4) * 6 + 8 + 3
8 * 4 + 9 + 7 * 4
5 * 3 * 9 * 9 * 5 * (6 + 2 + 4 + 5 * 9 * 7)
3 * 9 * 3 + 9
5 * (6 * (4 + 5 + 5 + 9) * 3) + (9 + 2 * 5 + (8 + 3 * 2 + 9) + 2) * 3
3 * (5 * (2 + 3 + 6 * 3) + 6) + 2
7 + ((7 * 3 * 4 * 5 * 3 + 2) + (6 * 3 + 7 + 6 + 9) * 3) * (7 + 7 * 3 + 8 + 2 + (3 * 5 + 5)) + (7 * 5 + (5 * 3) + 7 + 2 + 8) * 5
4 * 4 * 6 + 4
8 * (5 + 4 + 7 + (9 + 9 + 5)) * 3 * 7 + 2
4 * (7 + (6 * 4 * 4 + 6 * 8 + 5) + (3 * 5 + 8 * 6 + 5) + 4) * 7 * 4 * 7
2 + (5 * 6) + (5 + 4) * 8
9 * ((6 * 2 + 5) + 8 + 6 * 8 * 8 * 6) + 8 * 5 * 9 + 4
3 + ((5 + 3) + 7 * (3 + 5 * 3 + 9 + 5) * 6 * 6) + 2 + 5 * 9
4 * (8 + 4 + 2 * 8 + 6) + 9
(5 * 9 * 6 * 6) * 8 * 4
(9 * 7 + 8 * 3 * 8) + 9
8 * 9 + 4 + 2 * 9 * 2
5 * (2 + 7 + (2 + 7 * 5 + 2) * (3 * 5 + 5 * 7 * 8))
6 + (4 * 6 * (9 * 5 + 9 + 7) * 6 + 4) * 4 * 6
8 + 9 * 8 + (2 + 8 * (5 * 7 * 7 * 9 + 8 + 4) + (6 * 4 * 9 * 8 * 4 * 9)) * 7 * (3 * 9 + 8 + 2 * 4 * 8)
(9 * 7 * 4 + 5 * 8 * 7) + 2 + 4 + 3 + (5 + 5 + 8 * (4 + 2 * 7 * 8) + (7 + 2 + 6 * 5 + 2 + 5) * (4 + 3 * 8))
6 * 2 * 5 * 2 + (6 * 8) * (2 + 8 + 3 + 7 * 6)
(7 * 9) + 4 * 7 + (5 * 9 + 7 * 3 + (2 * 4 * 9 * 9 * 6)) + 8
6 * 4 + (5 * 6) * 7 + 6 * 7
(4 + 7 + 8 * 9 + (6 * 9 + 8) * (8 * 9 * 5 + 4 * 9 + 3)) * 2 * 3 + 6
6 + 5 + 9 * (6 + (8 + 8)) * 4 + 2
9 + (2 * (7 * 9 + 2 + 9) + 2) * 3 * 8 * ((4 + 6 + 9 + 5) * (5 + 2 + 9 + 3 + 5 * 9) + (8 * 2) * 3) + 9
(9 + (3 + 8 + 7 * 2) * 6 + 6 * 8 + 7) * 3
((4 * 4 * 9) * (3 * 6) * 3 * (8 * 4 * 5) * 5) + 2 + (9 * 5 + 8 * (7 * 4 + 9 + 3 * 3 + 2) + (3 * 4 * 9)) * 7 + 9
2 + 3 * (3 * 4 + 4 * 3 + 2 + 7) * 8 * 9
((6 * 7) + 3 + 7 + 3) + 4
(5 + 3) + 2 * (8 + 4) * 3 + 7 + 9
(8 + 5 + 5) * 6 + 6 * (5 + (7 * 6 + 7 * 6 + 3) + 2 + 5 * 6 + 6) * 3
9 + 2 * 5 + (8 + (8 + 6)) + 8 + (4 * 2)
(5 * 5 + 5) * (4 * 5 + 2 * 3 + 4) + 9
5 + (9 + (8 + 9 * 2 * 9 + 8) * 5 + (4 + 4 + 4 * 6) + 4) * ((3 + 9 * 7 + 8 * 2 * 7) + 3 + 6 + (3 * 3 * 7 * 2 + 3) + 2) * 5
2 + 6 + 5 + (6 * 3 * 9) + 2 * 9
8 * 7 + 9 * 2 + (3 + 7 * 6)
7 * 6 * (7 + 8 * (2 * 5)) * 2
9 * 6 * (8 * 8 * 4) + 6 * 6 * 5
9 * 5 * 9 + ((2 * 7 + 8) + (2 + 4 * 2 + 9 * 3 * 6) * (9 + 8)) + 8
2 * ((7 * 6 + 9 + 5 + 2 + 3) + 6 * (8 + 3 + 9) * 2 * 3 + 7) * 3 * (6 * 9 * 2 * 4) + 5 * 6
4 * (7 * 4 * 4 * (4 * 2)) + 4 + (3 * 9 * (5 + 2 * 7 + 8 + 8) + 5 + 6 + 5)
3 * 7 + 7 + (7 + 7) * 4 * ((8 + 4 * 3 + 7 + 3) * (2 * 3 + 4) + (2 * 6 * 3 + 6 * 2 + 7))
8 + 2 * 5 * (2 * 7 + 9 + 3 + (7 * 2) * 4)
4 + (9 + 3 + 5) * (6 * 3 + (6 + 8 * 2) * 5 * 4) + 3
8 * 2 * (5 * 9 + 4) + 5 + ((7 * 7 * 2 + 5 + 3 * 9) * 8) * 9
2 + 8 + 8 + 4 * ((7 + 9 * 7 + 5) * 5 + 2 * 9 * (2 + 2 + 7 * 7 + 4) * 3) + 5
(7 * 8 + 8) * 8
8 * 6 + 8 + 3 + 2 + (8 + 9 + 2)
6 + 4 * 9 * ((9 + 9 * 2) * (5 * 7 * 3 + 4 * 6 * 6))
(9 + 4 + 7) + 2 + ((8 * 8 * 8 + 7) + 3 * 3 + 8 + 5 * (9 * 7 + 3 + 2 + 2 + 9))
(9 * 2 + (6 * 4 * 8 * 9 * 9 + 5) * 2) * 7 + 4 * (6 + 7 * 5 * 5 * 6 * (9 * 3 + 8))
8 * (7 + 5 * (8 + 3 + 9) + 6 + 6) + 2 + (4 * 2 + 8 * (3 * 4) + 7) + (2 + 4) * 8
(6 * 4 * 7 * 7 * 6 * (5 + 6 + 4 * 8 * 9)) + 7 + (8 + 3 + 6 + 8) * 8 * 5
4 * (4 + (7 + 3 * 2 + 9)) * 3 + 6 * 7 * 4
9 * (8 * 6 + 7 * 9 + 4 + 9) * 7 * 4 + 8
((8 * 7 * 6 + 4) * (4 + 9 * 5 + 8 * 2 * 7) * 2 + (6 * 3 + 9 + 6 + 5 * 7)) * 4
5 + 2 * ((7 * 8 * 6 * 4) * 4) * 4 * 4 + 9
5 + (2 + 2 + 3 * 5) + 2 * 2 * (7 * 7 * 2 + 4)
8 * (7 + (9 + 5 * 6 * 6) * (6 + 5 + 7)) * 3 * 6
(7 * 7 * 2 + 3 + 9) + 3 + 7 * 4 + 8 + 4
5 * (7 * 6 + (8 + 5 + 2) + 7 * 7) * (6 * (2 + 5 * 4) + 4 * 7 + 4 * (6 + 7)) + 2

104
Cargo.lock generated
View File

@ -5,6 +5,7 @@ name = "advent"
version = "0.1.0"
dependencies = [
"anyhow",
"nom",
]
[[package]]
@ -12,3 +13,106 @@ name = "anyhow"
version = "1.0.34"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bf8dcb5b4bbaa28653b647d8c77bd4ed40183b48882e130c1f1ffb73de069fd7"
[[package]]
name = "arrayvec"
version = "0.5.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
[[package]]
name = "bitflags"
version = "1.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
[[package]]
name = "bitvec"
version = "0.19.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a7ba35e9565969edb811639dbebfe34edc0368e472c5018474c8eb2543397f81"
dependencies = [
"funty",
"radium",
"tap",
"wyz",
]
[[package]]
name = "cfg-if"
version = "0.1.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
[[package]]
name = "funty"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "lexical-core"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "db65c6da02e61f55dae90a0ae427b2a5f6b3e8db09f58d10efab23af92592616"
dependencies = [
"arrayvec",
"bitflags",
"cfg-if",
"ryu",
"static_assertions",
]
[[package]]
name = "memchr"
version = "2.3.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "nom"
version = "6.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "88034cfd6b4a0d54dd14f4a507eceee36c0b70e5a02236c4e4df571102be17f0"
dependencies = [
"bitvec",
"lexical-core",
"memchr",
"version_check",
]
[[package]]
name = "radium"
version = "0.5.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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3
Cargo.toml
View File

@ -7,4 +7,5 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
anyhow = "1.0"
anyhow = "1.0"
nom = "6.0"

141
src/bin/18.rs Normal file
View File

@ -0,0 +1,141 @@
use std::fmt;
use std::fs::File;
use std::io::{BufRead, BufReader};
// call with a starting parenthesis.
// returns the offset of the closing parenthesis
fn find_matching_paren(input: &str) -> usize {
let mut parens_count = 0;
for (i, item) in input.chars().enumerate() {
match item {
'(' => parens_count += 1,
')' => parens_count -= 1,
_ => (),
}
if parens_count == 0 {
return i+1;
}
}
return 0;
}
// call with a first number, returns the length of the number
fn find_number(input: &str) -> usize {
let mut i= 0;
for item in input.chars() {
match item {
'0'..='9' => (),
_ => return i,
}
i += 1;
}
return i;
}
#[derive(Debug)]
enum Token<'a> {
Number(i64),
Operator(Binop),
Parens(&'a str),
End,
}
type Binop = fn(i64, i64) -> i64;
fn add(a: i64, b: i64) -> i64 {
a + b
}
fn mul(a: i64, b: i64) -> i64 {
a * b
}
// returns the number of chars consumed, as well as a token.
fn get_token(input: &str) -> (usize, Token) {
let mut i : usize = 0;
for item in input.chars() {
match item {
'(' => {
let len = find_matching_paren(&input[i..]);
return (i + len, Token::Parens(&input[i..i + len]));
}
'+' => {
return (i + 1, Token::Operator(add));
}
'*' => {
return (i + 1, Token::Operator(mul));
}
'0'..='9' => {
let len = find_number(&input[i..]);
let val = input[i..i+len].parse::<i64>().unwrap();
return (i + len, Token::Number(val));
}
' ' => (),
_ => panic!("Unexpected input!"),
}
i += 1;
}
(i, Token::End)
}
// finds a left argument, right argument, and operator.
// calls the operator on the args and returns the result.
fn evaluate(input: &str) -> i64 {
let mut left_val;
let (offset, tok) = get_token(&input);
match tok {
Token::Number(n) => {
left_val = n;
},
Token::Parens(p) => {
left_val = evaluate(&p[1..p.len()-1]);
},
_ => panic!("expected a number or a parenthetical"),
}
let mut input = &input[offset..];
loop {
let operator;
let (offset, op) = get_token(&input);
match op {
Token::Operator(o) => {
operator = o;
},
Token::End => {
return left_val;
}
_ => panic!("expected an operator"),
}
let right_val;
input = &input[offset..];
let (offset, right) = get_token(&input);
match right {
Token::Number(n) => {
right_val = n;
},
Token::Parens(p) => {
right_val = evaluate(&p[1..p.len()-1]);
},
_ => panic!("expected a number or a parenthetical"),
}
input = &input[offset..];
left_val = operator(left_val, right_val)
}
}
fn main() -> anyhow::Result<()> {
let file = File::open("18.input")?;
let reader = BufReader::new(file);
let mut answer = 0;
for line in reader.lines() {
answer += evaluate(&line?);
}
//println!("eval: {}", evaluate("6 * 2 * 6 + (8 + 8 * (5 + 4 * 7 + 6 + 6 + 3)) * 8"));
println!("answer is: {}", answer);
Ok(())
}