@@ -5,6 +5,8 @@ fn main() {
55 let file_path = "input.txt" ; // change this to the path of your file
66 let contents = std:: fs:: read_to_string ( file_path) . expect ( "File Read error" ) ;
77
8+ /* Part 1 */
9+ 810 let re = Regex :: new ( r"mul\(\d{1,3},\d{1,3}\)" ) . unwrap ( ) ;
911 let matches: Vec < _ > = re. find_iter ( & contents) . map ( |m| {
1012 m. as_str ( ) . replace ( "mul(" , "" ) . replace ( ")" , "" )
@@ -16,4 +18,37 @@ fn main() {
1618 } ) . sum :: < u32 > ( ) ;
1719
1820 println ! ( "Part 1: {}" , part1_answer) ;
21+ 22+ /* Part 2 */
23+ 24+ let re = Regex :: new ( r"mul\(\d{1,3},\d{1,3}\)|do\(\)|don't\(\)" ) . unwrap ( ) ;
25+ let matches: Vec < _ > = re. find_iter ( & contents) . map ( |m| m. as_str ( ) ) . collect ( ) ;
26+ let mut control_flag = true ;
27+ let part2_answer: u32 = matches
28+ . iter ( )
29+ . map ( |m| match * m {
30+ "do()" => {
31+ control_flag = true ;
32+ return 0 ;
33+ }
34+ "don't()" => {
35+ control_flag = false ;
36+ return 0 ;
37+ }
38+ _ => {
39+ if !control_flag {
40+ return 0 ;
41+ }
42+ let nums: Vec < u32 > = m
43+ . replace ( "mul(" , "" )
44+ . replace ( ")" , "" )
45+ . split ( "," )
46+ . map ( |n| n. parse ( ) . unwrap ( ) )
47+ . collect ( ) ;
48+ nums[ 0 ] * nums[ 1 ]
49+ }
50+ } )
51+ . sum ( ) ;
52+ 53+ println ! ( "Part 2: {}" , part2_answer) ;
1954}
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