- commit
- c72b57251130d870803925ca2c5271f84d84e342
- parent
- 0d19eb76766256b424e9a7511516dece5091cece
- Author
- Tobias Bengfort <tobias.bengfort@posteo.de>
- Date
- 2021-12-24 11:00
foo
Diffstat
| M | 2021/24/part1.rs | 148 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--- |
1 files changed, 143 insertions, 5 deletions
diff --git a/2021/24/part1.rs b/2021/24/part1.rs
@@ -3,7 +3,12 @@ use std::fs::File; 3 3 use std::io::BufRead; 4 4 use std::io::BufReader; 5 56 -1 #[derive(PartialEq, Debug)]-1 6 fn s2c(s: &str) -> char { -1 7 assert_eq!(s.len(), 1); -1 8 return s.chars().next().unwrap(); -1 9 } -1 10 -1 11 #[derive(PartialEq, Debug, Copy, Clone)] 7 12 enum Token { 8 13 Add, 9 14 Mul, @@ -15,9 +20,136 @@ enum Token { 15 20 Input(u8), 16 21 } 17 2218 -1 fn s2c(s: &str) -> char {19 -1 assert_eq!(s.len(), 1);20 -1 return s.chars().next().unwrap();-1 23 fn print_formular(formular: &mut std::slice::Iter<'_, Token>) { -1 24 match formular.next() { -1 25 Some(Token::Add) => { -1 26 print!("("); -1 27 print_formular(formular); -1 28 print!(" + "); -1 29 print_formular(formular); -1 30 print!(")"); -1 31 }, -1 32 Some(Token::Mul) => { -1 33 print!("("); -1 34 print_formular(formular); -1 35 print!(" * "); -1 36 print_formular(formular); -1 37 print!(")"); -1 38 }, -1 39 Some(Token::Div) => { -1 40 print!("("); -1 41 print_formular(formular); -1 42 print!(" / "); -1 43 print_formular(formular); -1 44 print!(")"); -1 45 }, -1 46 Some(Token::Mod) => { -1 47 print!("("); -1 48 print_formular(formular); -1 49 print!(" % "); -1 50 print_formular(formular); -1 51 print!(")"); -1 52 }, -1 53 Some(Token::Eql) => { -1 54 print!("("); -1 55 print_formular(formular); -1 56 print!(" == "); -1 57 print_formular(formular); -1 58 print!(")"); -1 59 }, -1 60 Some(Token::Int(i)) => { -1 61 print!("{}", i); -1 62 }, -1 63 Some(Token::Var(c)) => { -1 64 print!("{}", c); -1 65 }, -1 66 Some(Token::Input(i)) => { -1 67 print!("in{}", i); -1 68 }, -1 69 _ => unreachable!(), -1 70 } -1 71 } -1 72 -1 73 fn optimize(input: Vec<Token>) -> Vec<Token> { -1 74 let mut stack = input; -1 75 let mut dirty = true; -1 76 while dirty { -1 77 let mut new = vec![]; -1 78 dirty = false; -1 79 let mut i = 0; -1 80 while i < stack.len() - 2 { -1 81 match stack[i..i+3] { -1 82 [Token::Mul, Token::Var(_), Token::Int(0)] => { -1 83 new.push(Token::Int(0)); -1 84 i += 2; -1 85 dirty = true; -1 86 }, -1 87 [Token::Mul, Token::Int(0), Token::Var(_)] => { -1 88 new.push(Token::Int(0)); -1 89 i += 2; -1 90 dirty = true; -1 91 }, -1 92 [Token::Mul, Token::Int(1), Token::Var(b)] => { -1 93 new.push(Token::Var(b)); -1 94 i += 2; -1 95 dirty = true; -1 96 }, -1 97 [Token::Mul, Token::Var(a), Token::Int(1)] => { -1 98 new.push(Token::Var(a)); -1 99 i += 2; -1 100 dirty = true; -1 101 }, -1 102 [Token::Add, Token::Int(0), Token::Var(b)] => { -1 103 new.push(Token::Var(b)); -1 104 i += 2; -1 105 dirty = true; -1 106 }, -1 107 [Token::Add, Token::Var(a), Token::Int(0)] => { -1 108 new.push(Token::Var(a)); -1 109 i += 2; -1 110 dirty = true; -1 111 }, -1 112 [Token::Div, Token::Var(a), Token::Int(1)] => { -1 113 new.push(Token::Var(a)); -1 114 i += 2; -1 115 dirty = true; -1 116 }, -1 117 [Token::Add, Token::Int(a), Token::Int(b)] => { -1 118 new.push(Token::Int(a + b)); -1 119 i += 2; -1 120 dirty = true; -1 121 }, -1 122 [Token::Mul, Token::Int(a), Token::Int(b)] => { -1 123 new.push(Token::Int(a * b)); -1 124 i += 2; -1 125 dirty = true; -1 126 }, -1 127 [Token::Div, Token::Int(a), Token::Int(b)] => { -1 128 new.push(Token::Int(a / b)); -1 129 i += 2; -1 130 dirty = true; -1 131 }, -1 132 [Token::Mod, Token::Int(a), Token::Int(b)] => { -1 133 new.push(Token::Int(a % b)); -1 134 i += 2; -1 135 dirty = true; -1 136 }, -1 137 [Token::Eql, Token::Int(a), Token::Int(b)] => { -1 138 new.push(Token::Int(if a == b {1} else {0})); -1 139 i += 2; -1 140 dirty = true; -1 141 }, -1 142 _ => new.push(stack[i]), -1 143 } -1 144 i += 1; -1 145 } -1 146 while i < stack.len() { -1 147 new.push(stack[i]); -1 148 i += 1; -1 149 } -1 150 stack = new; -1 151 } -1 152 return stack; 21 153 } 22 154 23 155 fn main() { @@ -69,6 +201,12 @@ fn main() { 69 201 }, 70 202 _ => unreachable!(), 71 203 }72 -1 println!("{} {:?}", i, stack);-1 204 -1 205 stack = optimize(stack); -1 206 -1 207 // println!("{} {:?}", i, stack); -1 208 println!("{}", i); -1 209 // print_formular(&mut stack.iter()); -1 210 // println!(""); 73 211 } 74 212 }