feat: add necessary result codes

pkg/models/result.go

@@ -8,14 +8,16 @@ import (
 type Result int32
 
 const (
-	NotTested               Result = 0 // change only with schema change
-	Accepted                Result = 1
-	CompilationError        Result = 2
-	MemoryLimitExceeded     Result = 3
-	TimeLimitExceeded       Result = 4
-    RuntimeError            Result = 5
-	SystemFailDuringTesting Result = 6
-	Testing                 Result = 7
+	NotTested               Result = 1 // change only with schema change
+	Accepted                Result = 2
+    WrongAnswer             Result = 3
+    PresentationError       Result = 4
+	CompilationError        Result = 5
+	MemoryLimitExceeded     Result = 6
+	TimeLimitExceeded       Result = 7
+    RuntimeError            Result = 8
+	SystemFailDuringTesting Result = 9
+	Testing                 Result = 10
 )
 
 var ErrBadResult = errors.New("bad result")