73 lines
2.0 KiB
Rust
73 lines
2.0 KiB
Rust
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const INPUT_MIN: u32 = 245318;
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const INPUT_MAX: u32 = 765747;
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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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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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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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