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@@ -0,0 +1,44 @@
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+package main
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+
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+import (
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+ "bufio"
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+ "fmt"
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+ "math"
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+ "os"
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+ "strconv"
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+ "strings"
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+)
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+
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+func main() {
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+ fmt.Println("Advent of Code 2025 - Day 9 - Part 1")
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+ f,_:= os.Open("9/input")
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+ defer f.Close()
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+ scanner:=bufio.NewScanner(f)
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+
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+ var red_walls [][]int
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+ for scanner.Scan(){
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+ line:= scanner.Text()
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+ line_sp := strings.Split(line, ",")
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+ x,_:= strconv.Atoi(line_sp[0])
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+ y,_:= strconv.Atoi(line_sp[1])
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+ red_walls = append(red_walls, []int{x,y})
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+ }
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+
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+ res := 0
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+ for i:= range red_walls {
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+ w1:= red_walls[i]
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+ for j:= i+1; j < len(red_walls); j++{
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+ w2:= red_walls[j]
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+ area := calculate_area(w1,w2)
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+ if area > res {
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+ res = area
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+ }
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+ }
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+ }
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+ fmt.Println(res)
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+}
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+
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+func calculate_area(w1,w2 []int) int{
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+ dx, dy := int(math.Abs(float64(w1[0]-w2[0]))), int(math.Abs(float64(w1[1]-w2[1])))
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+ return (dx+1) * (dy+1)
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+}
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