clear up result zero value

use local count variable

day-11/internal/two/solve.go

@@ -25,23 +25,21 @@ func Solve(buf []byte) (int, error) {
 	memo := make(map[int]result)
 	for range blinks {
 		next := make(map[int]int)
-		visited := make(map[int]int)
 
 		for stone, count := range old {
 			var r result
-			_, ok := visited[stone]
+			r, ok := memo[stone]
 			if !ok {
 				r = applyRules(stone)
 				memo[stone] = r
 			}
-			visited[stone] += count
 
 			switch r.kind {
 			case flip, multiply:
-				next[r.right] += visited[stone]
+				next[r.right] += count
 			case split:
-				next[r.left] += visited[stone]
-				next[r.right] += visited[stone]
+				next[r.left] += count
+				next[r.right] += count
 			}
 		}