brayevalerien Solutions to days 1→5 & days 8→12 (#48)

Author: brayevalerien

2023/01/brayevalerien/part1.v

@@ -0,0 +1,36 @@
+module main
+
+import os
+
+fn main() {
+	input_path := '../trebuchet-part1.input'
+
+	lines := os.read_lines(input_path) or { panic('Could not read input file.') }
+	mut sum := 0 // will contain the final result
+	for line in lines {
+		line_nums := get_line_nums(line)
+		sum += get_line_number(line_nums)
+	}
+	println('Final result: ${sum}')
+}
+
+// Given a string, returns the array of all numbers in this string
+fn get_line_nums(line string) []rune {
+	nums := []rune{len: 10, init: index.str()[0]}
+	mut line_nums := []rune{}
+	for c in line {
+		if rune(c) in nums {
+			line_nums << rune(c)
+		}
+	}
+	return line_nums
+}
+
+// Given a array of digits as runes, returns the 2-digits number formed by
+// the first digit in the array, concatenated with the last digit in the array.
+fn get_line_number(nums []rune) int {
+	// runes cannot be concatenated easily. So first cast to string, concatenate and cast to int.
+	mut res := rune(nums[0]).str()
+	res += rune(nums[nums.len - 1]).str()
+	return res.int()
+}

2023/01/brayevalerien/part2.v

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+module main
+
+import os
+
+fn main() {
+	input_path := '../trebuchet-part2.input'
+
+	lines := os.read_lines(input_path) or { panic('Could not read input file.') }
+	mut sum := 0 // will contain the final result
+	for line in lines {
+		line_nums := get_line_nums(line)
+		sum += get_line_number(line_nums)
+	}
+	println('Final result: ${sum}')
+}
+
+fn index(a []string, s string) int {
+	mut i := 0
+	for sp in a {
+		if sp == s {
+			return i
+		} else {
+			i += 1
+		}
+	}
+	return -1
+}
+
+// Given a string, returns the array of all numbers in this string
+// BUT! numbers can be spelled out with letters as well.
+// e.g. 'xtwone3four' -> [`2`, `1`, `3`, `4`]
+fn get_line_nums(line string) []rune {
+	nums := []rune{len: 10, init: index.str()[0]}
+	mut line_nums := []rune{}
+	for i in 0 .. line.len {
+		if rune(line[i]) in nums {
+			line_nums << rune(line[i])
+		} else {
+			spelled_num := get_spelled_number(line[i..])
+			if spelled_num != -1 {
+				line_nums << spelled_num.str()[0]
+			}
+		}
+	}
+	return line_nums
+}
+
+// Given a string, returns the number that s starts with, or -1 if s does not start with a number
+// e.g. 'xtwone3four' -> -1
+//      'twone3four' -> `2`
+//      '3four' -> -1
+fn get_spelled_number(s string) int {
+	spelled_nums := ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
+	min_len := 3 // minimum length of a spelled out number
+	max_len := 5 // maximum length of a spelled out number
+	for num_len in min_len .. (max_len + 1) {
+		if num_len <= s.len {
+			index_in_spelled_nums := index(spelled_nums, s[..num_len])
+			if index_in_spelled_nums != -1 {
+				return index_in_spelled_nums
+			}
+		} else {
+			break
+		}
+	}
+	return -1
+}
+
+// Given a array of digits as runes, returns the 2-digits number formed by
+// the first digit in the array, concatenated with the last digit in the array.
+fn get_line_number(nums []rune) int {
+	// runes cannot be concatenated easily. So first cast to string, concatenate and cast to int.
+	mut res := rune(nums[0]).str()
+	res += rune(nums[nums.len - 1]).str()
+	return res.int()
+}

2023/02/brayevalerien/part1.v

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+module main
+
+import math
+import os
+
+struct Game {
+	id    int // game ID
+	red   int // maximum number of red that appeared in the game
+	green int // maximum number of green that appeared in the game
+	blue  int // maximum number of blue that appeared in the game
+}
+
+// Constructs a Game from a line of the input file
+fn Game.new(s string) Game {
+	split := s.rsplit(': ')
+	id := split[1][5..]
+	record := split[0].rsplit('; ')
+	mut red := 0
+	mut green := 0
+	mut blue := 0
+	for set in record {
+		mut count_red := 0
+		mut count_green := 0
+		mut count_blue := 0
+		counts := set.rsplit(', ')
+		for count in counts {
+			if count.ends_with(' red') {
+				count_red += count.split(' red')[0].int()
+			} else if count.ends_with(' green') {
+				count_green += count.split(' green')[0].int()
+			} else if count.ends_with(' blue') {
+				count_blue += count.split(' blue')[0].int()
+			}
+		}
+		red = math.max(red, count_red)
+		green = math.max(green, count_green)
+		blue = math.max(blue, count_blue)
+	}
+	return Game{
+		id: id.int()
+		red: red
+		green: green
+		blue: blue
+	}
+}
+
+fn is_valid(game Game) bool {
+	// maximum number of cubes of each color in the bag
+	max_red := 12
+	max_green := 13
+	max_blue := 14
+	return game.red <= max_red && game.green <= max_green && game.blue <= max_blue
+}
+
+fn main() {
+	input_path := '../cube.input'
+
+	lines := os.read_lines(input_path) or { panic('Could not read input file.') }
+	mut result := 0
+	for line in lines {
+		game := Game.new(line)
+		if is_valid(game) {
+			result += game.id
+		}
+	}
+	println('Final result: ${result}')
+}

2023/02/brayevalerien/part2.v

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+module main
+
+import math
+import os
+
+struct Game {
+	id    int // game ID
+	red   int // maximum number of red that appeared in the game
+	green int // maximum number of green that appeared in the game
+	blue  int // maximum number of blue that appeared in the game
+}
+
+// Constructs a Game from a line of the input file
+fn Game.new(s string) Game {
+	split := s.rsplit(': ')
+	id := split[1][5..]
+	record := split[0].rsplit('; ')
+	mut red := 0
+	mut green := 0
+	mut blue := 0
+	for set in record {
+		mut count_red := 0
+		mut count_green := 0
+		mut count_blue := 0
+		counts := set.rsplit(', ')
+		for count in counts {
+			if count.ends_with(' red') {
+				count_red += count.split(' red')[0].int()
+			} else if count.ends_with(' green') {
+				count_green += count.split(' green')[0].int()
+			} else if count.ends_with(' blue') {
+				count_blue += count.split(' blue')[0].int()
+			}
+		}
+		red = math.max(red, count_red)
+		green = math.max(green, count_green)
+		blue = math.max(blue, count_blue)
+	}
+	return Game{
+		id: id.int()
+		red: red
+		green: green
+		blue: blue
+	}
+}
+
+// Return the power of a set of cubes of a game.
+// The power of a set of cubes is equal to the numbers of red, green, and blue cubes multiplied together.
+fn set_power(game Game) int {
+	// maximum number of cubes of each color in the bag
+	return game.red * game.green * game.blue
+}
+
+fn main() {
+	input_path := '../cube.input'
+
+	lines := os.read_lines(input_path) or { panic('Could not read input file.') }
+	mut result := 0
+	for line in lines {
+		game := Game.new(line)
+		result += set_power(game)
+	}
+	println('Final result: ${result}')
+}