2023.03

internal/2023/day_03/in.go

@@ -1,11 +1,200 @@
 package day_03
 
-type Day struct{}
+import (
+	"fmt"
+	"strings"
+
+	"git.rpjosh.de/RPJosh/go-logger"
+	"rpjosh.de/adventOfCode/pkg/utils"
+)
+
+type Day struct {
+	engine []string
+
+	currentRow  int
+	currentLine int
+}
 
 func (d *Day) Part1(in string) string {
-	return ""
+
+	// Initialize variables
+	sum := 0
+	d.currentLine = -1
+	d.engine = strings.Split(in, "\n")
+
+	for _, val := range d.engine {
+		if val == "" {
+			continue
+		}
+
+		// Initialize  variables
+		strVal := ""
+		isSymbolNear := false
+		d.currentRow = 0
+		d.currentLine++
+
+		// Loop through all characters and find ints
+		for _, str := range val {
+			if utils.IsInt(string(str)) {
+				strVal += string(str)
+				if !isSymbolNear {
+					// Check if a symbol is near
+					isSymbolNear = d.isSymbolNear()
+				}
+			} else {
+				// It's a '.' or a symbole
+				if strVal != "" && isSymbolNear {
+					logger.Debug("Found value %q", strVal)
+					sum += utils.ToInt(strVal)
+				}
+
+				// Reset variables
+				strVal = ""
+				isSymbolNear = false
+			}
+
+			d.currentRow += 1
+		}
+
+		// End of line
+		if strVal != "" && isSymbolNear {
+			logger.Debug("Found value %q", strVal)
+			sum += utils.ToInt(strVal)
+		}
+	}
+
+	return fmt.Sprintf("%d", sum)
+}
+
+func (d *Day) isSymbolNear() bool {
+
+	// Left and right
+	if d.isSymbole(d.currentRow-1, d.currentLine, ' ') || d.isSymbole(d.currentRow+1, d.currentLine, ' ') {
+		return true
+	}
+
+	// Top and bottom
+	if d.isSymbole(d.currentRow, d.currentLine-1, ' ') || d.isSymbole(d.currentRow, d.currentLine+1, ' ') {
+		return true
+	}
+
+	// Diagonale
+	if d.isSymbole(d.currentRow-1, d.currentLine-1, ' ') || d.isSymbole(d.currentRow-1, d.currentLine+1, ' ') {
+		return true
+	}
+	if d.isSymbole(d.currentRow+1, d.currentLine-1, ' ') || d.isSymbole(d.currentRow+1, d.currentLine+1, ' ') {
+		return true
+	}
+
+	return false
+}
+
+// isGearNear returns weather a * is near and the index of that gear
+// (row,line)
+func (d *Day) isGearNear() (bool, string) {
+
+	// Left and right
+	if d.isSymbole(d.currentRow-1, d.currentLine, '*') {
+		return true, fmt.Sprintf("%d,%d", d.currentRow-1, d.currentLine)
+	}
+	if d.isSymbole(d.currentRow+1, d.currentLine, '*') {
+		return true, fmt.Sprintf("%d,%d", d.currentRow+1, d.currentLine)
+	}
+
+	// Top and bottom
+	if d.isSymbole(d.currentRow, d.currentLine-1, '*') {
+		return true, fmt.Sprintf("%d,%d", d.currentRow, d.currentLine-1)
+	}
+	if d.isSymbole(d.currentRow, d.currentLine+1, '*') {
+		return true, fmt.Sprintf("%d,%d", d.currentRow, d.currentLine+1)
+	}
+
+	// Diagonale
+	if d.isSymbole(d.currentRow-1, d.currentLine-1, '*') {
+		return true, fmt.Sprintf("%d,%d", d.currentRow-1, d.currentLine-1)
+	}
+	if d.isSymbole(d.currentRow-1, d.currentLine+1, '*') {
+		return true, fmt.Sprintf("%d,%d", d.currentRow-1, d.currentLine+1)
+	}
+	if d.isSymbole(d.currentRow+1, d.currentLine-1, '*') {
+		return true, fmt.Sprintf("%d,%d", d.currentRow+1, d.currentLine-1)
+	}
+	if d.isSymbole(d.currentRow+1, d.currentLine+1, '*') {
+		return true, fmt.Sprintf("%d,%d", d.currentRow+1, d.currentLine+1)
+	}
+
+	return false, ""
+}
+
+// isSymbole checks if the characters at the given position is a rune.
+// If an invalid line or row is provided, this function returns false
+func (d *Day) isSymbole(row, line int, symbole rune) bool {
+	// Check out of bounds
+	if row < 0 || line < 0 || line >= len(d.engine) || row >= len(d.engine[line]) {
+		return false
+	}
+
+	val := d.engine[line][row]
+	return val != '.' && !utils.IsInt(string(val)) && (symbole == ' ' || symbole == rune(val))
 }
 
 func (d *Day) Part2(in string) string {
-	return ""
+	// Initialize variables
+	d.currentLine = -1
+	d.engine = strings.Split(in, "\n")
+	gears := make(map[string][]int, 0)
+
+	for _, val := range d.engine {
+		if val == "" {
+			continue
+		}
+
+		// Initialize  variables
+		strVal := ""
+		isGearNear := false
+		isGearNearPos := ""
+		d.currentRow = 0
+		d.currentLine++
+
+		// Loop through all characters and find ints
+		for _, str := range val {
+			if utils.IsInt(string(str)) {
+				strVal += string(str)
+				// Check if a symbol is near
+				if isNear, pos := d.isGearNear(); isNear {
+					isGearNear = true
+					isGearNearPos = pos
+				}
+			} else {
+				// It's a '.' or a symbole
+				if strVal != "" && isGearNear {
+					logger.Debug("Found pos %q with value %q", isGearNearPos, strVal)
+					gears[isGearNearPos] = append(gears[isGearNearPos], utils.ToInt(strVal))
+				}
+
+				// Reset variables
+				strVal = ""
+				isGearNear = false
+				isGearNearPos = ""
+			}
+
+			d.currentRow += 1
+		}
+
+		// End of line
+		// Check if a symbol is near
+		if isGearNear {
+			logger.Debug("Found pos %q with value %q", isGearNearPos, strVal)
+			gears[isGearNearPos] = append(gears[isGearNearPos], utils.ToInt(strVal))
+		}
+	}
+
+	sum := 0
+	for _, values := range gears {
+		if len(values) == 2 {
+			sum += values[0] * values[1]
+		}
+	}
+
+	return fmt.Sprintf("%d", sum)
 }

pkg/utils/utils.go

@@ -94,3 +94,8 @@ func ToInt(val string) int {
 
 	return value
 }
+
+func IsInt(val string) bool {
+	_, err := strconv.Atoi(val)
+	return err == nil
+}