updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -15,6 +15,7 @@
   * [All Permutations](https://github.com/TheAlgorithms/Python/blob/master/backtracking/all_permutations.py)
   * [All Subsequences](https://github.com/TheAlgorithms/Python/blob/master/backtracking/all_subsequences.py)
   * [Coloring](https://github.com/TheAlgorithms/Python/blob/master/backtracking/coloring.py)
+  * [Hamiltonian Cycle](https://github.com/TheAlgorithms/Python/blob/master/backtracking/hamiltonian_cycle.py)
   * [Minimax](https://github.com/TheAlgorithms/Python/blob/master/backtracking/minimax.py)
   * [N Queens](https://github.com/TheAlgorithms/Python/blob/master/backtracking/n_queens.py)
   * [Sudoku](https://github.com/TheAlgorithms/Python/blob/master/backtracking/sudoku.py)
@@ -89,6 +90,7 @@
     * [Number Of Possible Binary Trees](https://github.com/TheAlgorithms/Python/blob/master/data_structures/binary_tree/number_of_possible_binary_trees.py)
     * [Red Black Tree](https://github.com/TheAlgorithms/Python/blob/master/data_structures/binary_tree/red_black_tree.py)
     * [Segment Tree](https://github.com/TheAlgorithms/Python/blob/master/data_structures/binary_tree/segment_tree.py)
+    * [Segment Tree Other](https://github.com/TheAlgorithms/Python/blob/master/data_structures/binary_tree/segment_tree_other.py)
     * [Treap](https://github.com/TheAlgorithms/Python/blob/master/data_structures/binary_tree/treap.py)
   * Data Structures
     * Heap
@@ -499,6 +501,8 @@
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_25/sol1.py)
     * [Sol2](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_25/sol2.py)
     * [Sol3](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_25/sol3.py)
+  * Problem 26
+    * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_26/sol1.py)
   * Problem 27
     * [Problem 27 Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_27/problem_27_sol1.py)
   * Problem 28