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+001001110011 +100111111100 +111010001001 +101001000110 +001101000100 +110000000100 +111010110011 +000101110000 +010000010101 +000110111001 +100100100000 +110010001011 +110111100011 +101101101001 +100001100100 +000111010100 \ No newline at end of file diff --git a/03/main.go b/03/main.go new file mode 100644 index 0000000..2135b33 --- /dev/null +++ b/03/main.go @@ -0,0 +1,120 @@ +package main + +import ( + "log" + "math" + "os" + "strings" + + "github.com/thoas/go-funk" +) + +func main() { + inputBytes, _ := os.ReadFile("input.txt") + inputs := strings.Split(string(inputBytes), "\n") + + log.Println("Puzzle 1:", puzzle1(inputs)) + log.Println("Puzzle 2:", puzzle2(inputs)) +} + +func puzzle1(input []string) int { + // Each bit in the gamma rate can be determined by finding the most common bit in the corresponding position of all numbers in the diagnostic report. + // The epsilon rate is calculated in a similar way; rather than use the most common bit, the least common bit from each position is used. + zeros := make([]int, len(input[0])) + ones := make([]int, len(input[0])) + for _, line := range input { + for i, c := range line { + if c == '0' { + zeros[i]++ + } else if c == '1' { + ones[i]++ + } + } + } + // Get most and least common + mostCommon := make([]int, len(input[0])) + leastCommon := make([]int, len(input[0])) + for i, z := range zeros { + if z > ones[i] { + mostCommon[i] = 0 + leastCommon[i] = 1 + } else { + mostCommon[i] = 1 + leastCommon[i] = 0 + } + } + // Convert mostCommon and leastCommon from bits to ints + gammaRate := 0 + for i, c := range funk.ReverseInt(mostCommon) { + gammaRate += c * int(math.Pow(2, float64(i))) + } + epsilonRate := 0 + for i, c := range funk.ReverseInt(leastCommon) { + epsilonRate += c * int(math.Pow(2, float64(i))) + } + // Return the product of the two rates, the power consumption + return gammaRate * epsilonRate +} + +func puzzle2(input []string) int { + // Most common bit on position + mostCommon := func(input []string, position int, whenEqual int) int { + zeros := 0 + ones := 0 + for _, line := range input { + if line[position] == '0' { + zeros++ + } else if line[position] == '1' { + ones++ + } + } + if zeros > ones { + return 0 + } else if ones > zeros { + return 1 + } + return whenEqual + } + // Filter inputs + inputLen := len(input[0]) + oxygen := input + for i := 0; i < inputLen; i++ { + if len(oxygen) < 2 { + break + } + most := mostCommon(oxygen, i, 1) + oxygen = funk.FilterString(oxygen, func(s string) bool { + if most == 1 { + return s[i] == '1' + } else { + return s[i] == '0' + } + }) + } + co2 := input + for i := 0; i < inputLen; i++ { + if len(co2) < 2 { + break + } + least := 1 - mostCommon(co2, i, 1) + co2 = funk.FilterString(co2, func(s string) bool { + if least == 1 { + return s[i] == '1' + } else { + return s[i] == '0' + } + }) + } + // Convert first string in oxygen from bits to int + oxygenRating := 0 + for i, c := range funk.ReverseString(oxygen[0]) { + oxygenRating += int(c-'0') * int(math.Pow(2, float64(i))) + } + // Convert first string in co2 from bits to int + co2Rating := 0 + for i, c := range funk.ReverseString(co2[0]) { + co2Rating += int(c-'0') * int(math.Pow(2, float64(i))) + } + // Return the product of the two rates, the life support rating + return oxygenRating * co2Rating +} diff --git a/03/main_test.go b/03/main_test.go new file mode 100644 index 0000000..b7c4c41 --- /dev/null +++ b/03/main_test.go @@ -0,0 +1,14 @@ +package main + +import ( + "strings" + "testing" + + "github.com/stretchr/testify/assert" +) + +func Test(t *testing.T) { + input := `00100,11110,10110,10111,10101,01111,00111,11100,10000,11001,00010,01010` + assert.Equal(t, 198, puzzle1(strings.Split(input, ","))) + assert.Equal(t, 230, puzzle2(strings.Split(input, ","))) +}