Add solution for day 3

three/diagnostic.go

@@ -0,0 +1,144 @@
+package three
+
+import (
+	"bufio"
+	"os"
+)
+
+type report struct {
+	gammaRate    int
+	epsilonRate  int
+	oxygenRating int
+	co2Rating    int
+	values       []string
+}
+
+func (r *report) read(filename string) error {
+	file, err := os.Open(filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		r.values = append(r.values, scanner.Text())
+	}
+
+	return nil
+}
+
+func (r *report) computePowerConsumption() {
+	if len(r.values) == 0 {
+		return
+	}
+
+	inputLength := len(r.values[0])
+
+	// Loop over every bit of the input
+	for i := 0; i < inputLength; i++ {
+		ones := 0
+		zeros := 0
+
+		// Loop over every value to determine the most and least common bit values
+		for _, value := range r.values {
+			if value[i] == '1' {
+				ones++
+			} else {
+				zeros++
+			}
+		}
+
+		if ones > zeros {
+			r.gammaRate = r.gammaRate<<1 + 1
+			r.epsilonRate = r.epsilonRate<<1 + 0
+		} else {
+			r.gammaRate = r.gammaRate<<1 + 0
+			r.epsilonRate = r.epsilonRate<<1 + 1
+		}
+	}
+}
+
+func (r *report) computeOxygenRating() {
+	if len(r.values) == 0 {
+		return
+	}
+
+	inputLength := len(r.values[0])
+
+	filtered := r.values
+	// Loop over every bit of the input
+	for i := 0; i < inputLength; i++ {
+		if len(filtered) == 1 {
+			break
+		}
+
+		ones := []string{}
+		zeros := []string{}
+
+		// Loop over every value to determine the most and least common bit values
+		for _, value := range filtered {
+			if value[i] == '1' {
+				ones = append(ones, value)
+			} else {
+				zeros = append(zeros, value)
+			}
+		}
+
+		if len(ones) >= len(zeros) {
+			filtered = ones
+		} else {
+			filtered = zeros
+		}
+	}
+
+	for _, b := range filtered[0] {
+		if b == '1' {
+			r.oxygenRating = r.oxygenRating<<1 + 1
+		} else {
+			r.oxygenRating = r.oxygenRating<<1 + 0
+		}
+	}
+}
+
+func (r *report) computeCO2Rating() {
+	if len(r.values) == 0 {
+		return
+	}
+
+	inputLength := len(r.values[0])
+
+	filtered := r.values
+	// Loop over every bit of the input
+	for i := 0; i < inputLength; i++ {
+		if len(filtered) == 1 {
+			break
+		}
+
+		ones := []string{}
+		zeros := []string{}
+
+		// Loop over every value to determine the most and least common bit values
+		for _, value := range filtered {
+			if value[i] == '1' {
+				ones = append(ones, value)
+			} else {
+				zeros = append(zeros, value)
+			}
+		}
+
+		if len(ones) < len(zeros) {
+			filtered = ones
+		} else {
+			filtered = zeros
+		}
+	}
+
+	for _, b := range filtered[0] {
+		if b == '1' {
+			r.co2Rating = r.co2Rating<<1 + 1
+		} else {
+			r.co2Rating = r.co2Rating<<1 + 0
+		}
+	}
+}