Cleanup.

hw4/simu3/randomtrace.c

@@ -14,7 +14,7 @@ int main(int argc, char* argv[]) {
   s = atoi(argv[1]);
   t = atoi(argv[2]);
   for (i = 0; i < s; i++) {
-    r = (int) ((rand() % t));
+    r = (int) (rand() % t);
     if (i != s - 1) {
       printf("%d,", r);
     } else {