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@@ -0,0 +1,72 @@
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+const INPUT_MIN: u32 = 245318;
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+const INPUT_MAX: u32 = 765747;
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+
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+fn solve_part1() -> u32 {
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+ let mut counter = 0;
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+ for num in INPUT_MIN..=INPUT_MAX {
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+ let num_string = num.to_string();
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+ let mut previous = None;
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+ let mut has_double = false;
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+ let mut decreasing = false;
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+ for c in num_string.chars() {
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+ match previous {
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+ None => previous = Some(c),
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+ Some(p) => {
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+ if p == c {
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+ has_double = true;
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+ }
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+ if p.to_digit(10) > c.to_digit(10) {
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+ decreasing = true;
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+ break;
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+ }
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+ previous = Some(c);
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+ }
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+ }
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+ }
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+ if has_double && !decreasing {
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+ counter += 1;
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+ }
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+ }
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+ counter
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+}
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+
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+fn solve_part2() -> u32 {
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+ // too lazy to DRY it up
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+ let mut counter = 0;
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+ for num in INPUT_MIN..=INPUT_MAX {
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+ let num_string = num.to_string();
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+ let mut previous = None;
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+ let mut has_double = false;
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+ let mut matching_group_count = 1;
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+ let mut decreasing = false;
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+ for c in num_string.chars() {
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+ match previous {
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+ None => previous = Some(c),
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+ Some(p) => {
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+ if p == c {
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+ matching_group_count += 1;
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+ } else {
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+ if matching_group_count == 2 {
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+ has_double = true;
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+ }
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+ matching_group_count = 1;
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+ }
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+ if p.to_digit(10) > c.to_digit(10) {
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+ decreasing = true;
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+ break;
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+ }
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+ previous = Some(c);
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+ }
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+ }
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+ }
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+ if (matching_group_count == 2 || has_double) && !decreasing {
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+ counter += 1;
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+ }
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+ }
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+ counter
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+}
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+
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+fn main() {
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+ println!("Part 1: {}", solve_part1());
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+ println!("Part 2: {}", solve_part2());
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+}
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