Improve day 13

day13/common/distress.go

@@ -81,29 +81,26 @@ func (pair Pair) CheckOrder() bool {
 
 
 func ParseListPacket(listString string) ListPacket {
+  var j int
   packet := ListPacket{[]Packet{}, false}
 
-  currI := 1
-  for i := 1; i < len(listString); i++ {
-    if listString[i] == ',' || listString[i] == ']' {
-      if listString[currI] >= '0' && listString[currI] <= '9' {
-        convertedInt, _ := strconv.Atoi(listString[currI:i])
-        packet.content = append(packet.content, IntPacket(convertedInt))
-      } else if listString[currI] == '[' {
-        depth := 1
-        var j int
-        for j = currI + 1; depth != 0; j++ {
-          if listString[j] == '[' {
-            depth++
-          } else if listString[j] == ']' {
-            depth--
-          }
+  for i := 1; i < len(listString) - 1; i++ {
+    if listString[i] >= '0' && listString[i] <= '9' {
+      for j = i + 1; listString[j] != ',' && listString[j] != ']'; j++ {}
+      convertedInt, _ := strconv.Atoi(listString[i:j])
+      packet.content = append(packet.content, IntPacket(convertedInt))
+    } else if listString[i] == '[' {
+      depth := 1
+      for j = i + 1; depth != 0; j++ {
+        if listString[j] == '[' {
+          depth++
+        } else if listString[j] == ']' {
+          depth--
         }
-        packet.content = append(packet.content, ParseListPacket(listString[currI:j]))
-        i = j
       }
-      currI = i + 1
+      packet.content = append(packet.content, ParseListPacket(listString[i:j]))
     }
+    i = j
   }
 
   return packet