+
+ swap(a, lo,end);
+ if (b != null) swap(b, lo,end);
+
+ sort(a, b, c, start, lo-1);
+ sort(a, b, c, lo+1, end);
+ }
+
+ private static final void swap(Vec vec, int a, int b) {
+ if(a != b) {
+ Object tmp = vec.store[a];
+ vec.store[a] = vec.store[b];
+ vec.store[b] = tmp;
+ }