Fix infinite loop

Co-authored-by: David Schlachter <https://github.com/davidschlachter>

flake.nix

@@ -80,6 +80,7 @@
           clean
 
           go
+          gofumpt
         ]);
 
         shellHook = ''

src/l33tcode/841.go

@@ -3,22 +3,22 @@ package main
 import "fmt"
 
 func main() {
-	res := canVisitAllRooms([][]int{{1}, {2}, {}})
+	res := canVisitAllRooms([][]int{{1, 3}, {3, 0, 1}, {2}, {0}})
 	fmt.Printf("%+v\n", res)
 }
 
 func canVisitAllRooms(rooms [][]int) bool {
 	if len(rooms) > 0 && len(rooms[0]) == 0 {
-			return false
+		return false
 	}
 
 	keys := getAllKeys(0, make(map[int]struct{}), rooms)
-	keys[0] = struct{}{}    
+	keys[0] = struct{}{}
 
 	for i := 0; i < len(rooms); i++ {
-			if _, ok := keys[i]; !ok {
-					return false
-			}
+		if _, ok := keys[i]; !ok {
+			return false
+		}
 	}
 	return true
 }
@@ -27,15 +27,17 @@ func getAllKeys(index int, seen map[int]struct{}, rooms [][]int) map[int]struct{
 	keys := map[int]struct{}{}
 
 	for j := 0; j < len(rooms[index]); j++ {
-			if _, ok := keys[rooms[index][j]]; ok {
-					continue
-			}
-			keys[rooms[index][j]] = struct{}{}
-			insideKeys := getAllKeys(j, keys, rooms)
-			for k := range insideKeys {
-					keys[k] = struct{}{}
-			}
+		if _, ok := seen[rooms[index][j]]; ok {
+			continue
+		} else {
+			seen[rooms[index][j]] = struct{}{}
+		}
+		keys[rooms[index][j]] = struct{}{}
+		insideKeys := getAllKeys(rooms[index][j], seen, rooms)
+		for k := range insideKeys {
+			keys[k] = struct{}{}
+		}
 	}
-	
+
 	return keys
 }