modify code

Author: algorithmzuo

src/class07/HeapGreater.java

@@ -15,7 +15,7 @@ public class HeapGreater<T> {
 private int heapSize;
 private Comparator<? super T> comp;
 
-public HeapGreater(Comparator<T> c) {
+public HeapGreater(Comparator<? super T> c) {
 heap = new ArrayList<>();
 indexMap = new HashMap<>();
 heapSize = 0;