Day 7, Part 1, Part 2 (#37)

Co-authored-by: JingerJack <[email protected]>

Author: jacksonmowry

2023/07/camel_cards.input

@@ -0,0 +1,5 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483

2023/07/jacksonmowry.v

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+module main
+
+import os
+
+const card_to_val = {
+	`A`: 13
+	`K`: 12
+	`Q`: 11
+	`J`: 10
+	`T`: 9
+	`9`: 8
+	`8`: 7
+	`7`: 6
+	`6`: 5
+	`5`: 4
+	`4`: 3
+	`3`: 2
+	`2`: 1
+}
+
+const card_to_val_2 = {
+	`A`: 13
+	`K`: 12
+	`Q`: 11
+	`T`: 10
+	`9`: 9
+	`8`: 8
+	`7`: 7
+	`6`: 6
+	`5`: 5
+	`4`: 4
+	`3`: 3
+	`2`: 2
+	`J`: 1
+}
+
+fn main() {
+	filename := 'camel_cards.input'
+	println('Part 1: ${solver(filename, false)!}')
+	println('Part 2: ${solver(filename, true)!}')
+}
+
+fn solver(filename string, part_2 bool) !int {
+	mut lines := os.read_lines(filename)!.map(it.split(' '))
+	for i, hand in lines {
+		mut counts := map[u8]int{}
+		for card in hand[0] {
+			counts[card]++
+		}
+		mut freq := []int{}
+		mut j_count := 0
+		for key, val in counts {
+			if part_2 && key == `J` {
+				j_count += val
+			} else {
+				freq << val
+			}
+		}
+		if j_count == 5 {
+			lines[i] << 7.str()
+			continue
+		}
+		freq.sort(b < a)
+		if part_2 {
+			freq[0] += j_count
+		}
+		lines[i] << score_hand(freq)
+	}
+	if part_2 {
+		lines.sort_with_compare(fn (mut a []string, mut b []string) int {
+			if a[2] < b[2] {
+				return -1
+			} else if a[2] > b[2] {
+				return 1
+			}
+			for i := 0; i < 5; i++ {
+				if card_to_val_2[a[0][i]] == card_to_val_2[b[0][i]] {
+					continue
+				} else if card_to_val_2[a[0][i]] < card_to_val_2[b[0][i]] {
+					return -1
+				} else {
+					return 1
+				}
+			}
+			return 0
+		})
+	} else {
+		lines.sort_with_compare(fn (mut a []string, mut b []string) int {
+			if a[2] < b[2] {
+				return -1
+			} else if a[2] > b[2] {
+				return 1
+			}
+			for i := 0; i < 5; i++ {
+				if card_to_val[a[0][i]] == card_to_val[b[0][i]] {
+					continue
+				} else if card_to_val[a[0][i]] < card_to_val[b[0][i]] {
+					return -1
+				} else {
+					return 1
+				}
+			}
+			return 0
+		})
+	}
+	mut sum := 0
+	for i := 0; i < lines.len; i++ {
+		sum += lines[i][1].int() * (i + 1)
+	}
+	return sum
+}
+
+fn score_hand(hand_counts []int) string {
+	return match hand_counts[0] {
+		5 {
+			7.str()
+		}
+		4 {
+			6.str()
+		}
+		3 {
+			if hand_counts[1] == 2 {
+				5.str()
+			} else {
+				4.str()
+			}
+		}
+		2 {
+			if hand_counts[1] == 2 {
+				3.str()
+			} else {
+				2.str()
+			}
+		}
+		1 {
+			1.str()
+		}
+		else {
+			panic('invalid card count')
+		}
+	}
+}

known_outputs/2023/07/jacksonmowry.out

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+Part 1: 6440
+Part 2: 5905