Fix maximum Fenwick tree range values after updates

Author: dhairyajangir

data_structures/binary_tree/maximum_fenwick_tree.py

@@ -81,7 +81,9 @@ def update(self, index: int, value: int) -> None:
             if current_left_border == index:
                 self.tree[index] = value
             else:
-                self.tree[index] = max(value, current_left_border, index)
+                self.tree[index] = max(
+                    self.arr[index], self.query(current_left_border, index)
+                )
             index = self.get_next(index)
 
     def query(self, left: int, right: int) -> int: