Coding Interview Prep

A comprehensive collection of coding interview problems and solutions, featuring LeetCode problems organized by topic and difficulty. This repository contains well-documented Python solutions with explanations to help you prepare for technical interviews at top tech companies.

Citation

If you find this repository helpful in your interview preparation or research, please consider citing it:

@misc{chen2025codinginterview,
  title={Coding Interview Prep},
  author={Chen, Yi-Wei},
  year={2025},
  publisher={GitHub},
  journal={GitHub repository},
  howpublished={\url{https://github.com/YIWEI-CHEN/coding-interview-prep}}
}

License

This project is licensed under the MIT License - see the LICENSE file for details.

Author

Yi-Wei Chen
Senior Software Engineer | AI Infrastructure & Applied ML

Name		Name	Last commit message	Last commit date
Latest commit History 102 Commits
Arrays_Hashing		Arrays_Hashing
Bit_Manipulation		Bit_Manipulation
Data_Structures		Data_Structures
Intervals		Intervals
Microsoft		Microsoft
Stack		Stack
Trees		Trees
.gitignore		.gitignore
0007_reverse_integer.py		0007_reverse_integer.py
0015_3sum.py		0015_3sum.py
0031_next_permutation.py		0031_next_permutation.py
0035_search_insert_position.py		0035_search_insert_position.py
0039_2_max_even_sum_subarray_of_k.py		0039_2_max_even_sum_subarray_of_k.py
0039_combination_sum.py		0039_combination_sum.py
0056_merge_intervals.py		0056_merge_intervals.py
0075_sort_colors.py		0075_sort_colors.py
0094_binary_tree_inorder_traversal.py		0094_binary_tree_inorder_traversal.py
0098_validate_binary_search_tree.py		0098_validate_binary_search_tree.py
0100_same_tree.py		0100_same_tree.py
0102_binary_tree_level_traversal.py		0102_binary_tree_level_traversal.py
0104_maximum_depth_binary_tree.py		0104_maximum_depth_binary_tree.py
0105_bt_preorder_Inorder_traversal.py		0105_bt_preorder_Inorder_traversal.py
0130_surrounded_regions.py		0130_surrounded_regions.py
0144_binary_tree_preorder_traversal.py		0144_binary_tree_preorder_traversal.py
0145_binary_tree_postoder_traversal.py		0145_binary_tree_postoder_traversal.py
0167_two_sum_sorted_array.py		0167_two_sum_sorted_array.py
0172_factorial_trailing_zeroes.py		0172_factorial_trailing_zeroes.py
0200_number_of_islands.py		0200_number_of_islands.py
0203_remove_list_elements.py		0203_remove_list_elements.py
0231_power_two.py		0231_power_two.py
0235_lowest_common_ancestor_bst.py		0235_lowest_common_ancestor_bst.py
0274_h_Index.py		0274_h_Index.py
0275_h_index_ii.py		0275_h_index_ii.py
0326_power_three.py		0326_power_three.py
0342_power_four.py		0342_power_four.py
0344_reverse_string.py		0344_reverse_string.py
0345_reverse_vowels_string.py		0345_reverse_vowels_string.py
0368_largest_divisible_subset.py		0368_largest_divisible_subset.py
0380_insert_delete_get_random.py		0380_insert_delete_get_random.py
0392_is_subsequence.py		0392_is_subsequence.py
0406_sorted_by_eight.py		0406_sorted_by_eight.py
0426_convert_bst_to_doubly_lnked_list.py		0426_convert_bst_to_doubly_lnked_list.py
0468_validate_ip_address.py		0468_validate_ip_address.py
0518_coin_change2.py		0518_coin_change2.py
0528_random_pick_weight.py		0528_random_pick_weight.py
0572_subtree_another_tree.py		0572_subtree_another_tree.py
0700_search_binary_search_tree.py		0700_search_binary_search_tree.py
0787_cheapest_flights_K_stops.py		0787_cheapest_flights_K_stops.py
0945_2_make_frequency_unique.py		0945_2_make_frequency_unique.py
0945_minimum_increment_make_array_unique.py		0945_minimum_increment_make_array_unique.py
1029_two_city_scheduling.py		1029_two_city_scheduling.py
1044_longest_duplicate_substring.py		1044_longest_duplicate_substring.py
1055_shortest_way_form_string.py		1055_shortest_way_form_string.py
1143_longest_common_subsequence.py		1143_longest_common_subsequence.py
1275_winner_tic_tac_toe_game.py		1275_winner_tic_tac_toe_game.py
1822_sign_of_products_array.py		1822_sign_of_products_array.py
LICENSE		LICENSE
README.md		README.md
delete_node_linkedlist.py		delete_node_linkedlist.py
guess_the_word.py		guess_the_word.py
int_to_string.py		int_to_string.py
odd_composition.py		odd_composition.py
topological_sort.py		topological_sort.py
word_ladder.py		word_ladder.py

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