K&R / C library

atoi.py (easy, arrays)
itoa.py (easy, arrays)
squeeze.py (easy, arrays)

Interactive Python

word_ladder.py (hard, graphs, bfs)
knight_tour.py (hard, graphs, dfs)

Programming Pearls

largest_contiguous_subvector.py (moderate/hard, arrays, dynamic programming)

Codility

equi_index.py (easy, arrays)
tape_equilibrium.py (easy, arrays)
prefix_set.py (easy, arrays)
asymmetry_index.py (moderate) - need to fix
disc_intersections.py (moderate/hard, arrays, binary search)
base_neg2.py (moderate/hard)

CodeEval

fizzbuzz.py (easy)
multiples.py (easy)
number_of_ones.py (easy/moderate, bits)
lowest_common_ancestor.py (easy/moderate, bst)
wines.py (easy/moderate)
pass_triangle.py (moderate)
pascal_triangle.py (moderate)
digit_stats.py (hard, division)

Pramp

lover_letter.py (easy, hash tables)
different_number.py (easy, arrays, hashing)
duplicates.py (easy, searching, arrays, binary search)
largest_smaller.py (easy/moderate, bst)
quad_combination.py (easy/moderate, searching, arrays, hash tables)
successor_search.py (easy/moderate, bst)
inorder.py (moderate, bst)
smallest_substring.py (moderate/hard, searching, strings)
budget_cuts.py (hard, arrays, binary search)

Cracking the Coding Interview

replace_spaces.py (easy, arrays)
string_compression.py (easy, arrays, strings)
remove_dups.py (easy, linked lists)
kth_to_last.py (easy, linked lists, recursion)
remove_middle_node.py (easy, linked lists)

Geeks For Geeks

rotate_matrix.py (easy/moderate, matrix)
closest_pair.py (easy/moderate, searching, arrays, mergesort)
closest_pair2.py (easy/moderate, searching, arrays, mergesort)
closest_trio.py (easy/moderate, searching, arrays, mergesort)
nearest_smaller.py (moderate, searching, arrays, stacks)
pivot_index.py (moderate, searching, arrays)
url_shortener.py (moderate, arrays, division)
digits_sum.py (moderate, dynamic programming)
edit_distance.py (moderate, dynamic programming)
rod_cut.py (moderate, dynamic programming)
tree_views.py (moderate)
level_order.py, vertical_order.py (moderate)

Toptal

even_numbers.py (easy)

https://github.com/juchem/prep

count_words.py (easy, strings)
k_modes.py (moderate, hash tables, arrays, min-heaps)
interval_overlaps.py (moderate, arrays, mergesort)
division.py (moderate/hard, recursion, bits)

Miscellaneous

reconstruct_serialized_tree.py (easy, hash tables)
square_root.py (easy, binary search)
fib.py (easy, dynamic programming)
tree_to_linked_list.py (moderate, bst, linked lists, stacks)
first_nonrepeat_char.py (moderate/hard, arrays, hash tables, linked lists)
itertools_recipes.py (not an exercise, stolen from python docs)
conway_game_of_life.py
coin_change.py (moderate, dynamic programming)
longest_substring.py (moderate/hard, searching, strings)
anagrams.py (moderate/hard, strings)
longest_ascending.py (hard, arrays, binary search)

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https://github.com/juchem/prep

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Name		Name	Last commit message	Last commit date
input		input
lib		lib
README.md		README.md
activity_selection.py		activity_selection.py
alien_language.py		alien_language.py
anagrams.py		anagrams.py
asymmetry_index.py		asymmetry_index.py
atoi.py		atoi.py
base_neg2.py		base_neg2.py
binary_search.py		binary_search.py
box_stacking.py		box_stacking.py
budget_cuts.py		budget_cuts.py
build_binary_tree.py		build_binary_tree.py
building_bridges.py		building_bridges.py
check_balanced_tree.py		check_balanced_tree.py
check_bst.py		check_bst.py
check_parens.py		check_parens.py
closest_pair.py		closest_pair.py
closest_pair2.py		closest_pair2.py
closest_trio.py		closest_trio.py
coin_change.py		coin_change.py
combinations.py		combinations.py
compare_two_bst.py		compare_two_bst.py
connect4.py		connect4.py
conway_game_of_life.py		conway_game_of_life.py
count_words.py		count_words.py
dec_to_bin.py		dec_to_bin.py
different_number.py		different_number.py
digit_stats.py		digit_stats.py
digits_sum.py		digits_sum.py
disc_intersections.py		disc_intersections.py
division.py		division.py
duplicates.py		duplicates.py
edit_distance.py		edit_distance.py
equi_index.py		equi_index.py
even_numbers.py		even_numbers.py
factors.py		factors.py
fib.py		fib.py
find_pairs.py		find_pairs.py
first_nonrepeat_char.py		first_nonrepeat_char.py
fizzbuzz.py		fizzbuzz.py
flatten_linked_list.py		flatten_linked_list.py
index_element_equality.py		index_element_equality.py
inorder.py		inorder.py
inorder_successor.py		inorder_successor.py
insertion_sort.py		insertion_sort.py
intervals_overlap.py		intervals_overlap.py
itertools_recipes.py		itertools_recipes.py
itoa.py		itoa.py
k_modes.py		k_modes.py
knapsack.py		knapsack.py
knight_tour.py		knight_tour.py
kth_to_last.py		kth_to_last.py
largest_contiguous_subvector.py		largest_contiguous_subvector.py
largest_smaller.py		largest_smaller.py
level_order.py		level_order.py
linked_list_cycle.py		linked_list_cycle.py
linked_list_middle.py		linked_list_middle.py
longest_ascending.py		longest_ascending.py
longest_substring.py		longest_substring.py
love_letter.py		love_letter.py
lowest_common_ancestor.py		lowest_common_ancestor.py
lowest_common_ancestor2.py		lowest_common_ancestor2.py
mergesort.py		mergesort.py
most_frequent_int.py		most_frequent_int.py
multiples.py		multiples.py
nearest_smaller.py		nearest_smaller.py
number_of_ones.py		number_of_ones.py
palindrome.py		palindrome.py
palindrome2.py		palindrome2.py
partition_linked_list.py		partition_linked_list.py
pascal_triangle.py		pascal_triangle.py
pass_triangle.py		pass_triangle.py
permutations.py		permutations.py
pivot_index.py		pivot_index.py
prefix_set.py		prefix_set.py
primality.py		primality.py
quad_combination.py		quad_combination.py
quicksort.py		quicksort.py
reconstruct_serialized_tree.py		reconstruct_serialized_tree.py
remove_dups.py		remove_dups.py
remove_middle_node.py		remove_middle_node.py
replace_spaces.py		replace_spaces.py
reverse_linked_list.py		reverse_linked_list.py
reverse_linked_list2.py		reverse_linked_list2.py
reverse_words_in_sentence.py		reverse_words_in_sentence.py
rod_cut.py		rod_cut.py
rotate_matrix.py		rotate_matrix.py
rotated_array.py		rotated_array.py
rotated_arrays.py		rotated_arrays.py
selection_sort.py		selection_sort.py
smallest_substring.py		smallest_substring.py
smallest_substring2.py		smallest_substring2.py
smallest_text_snippet.py		smallest_text_snippet.py
spiral_matrix.py		spiral_matrix.py
square_root.py		square_root.py
squeeze.py		squeeze.py
string_compression.py		string_compression.py
substring.py		substring.py
successor_search.py		successor_search.py

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K&R / C library

Interactive Python

Programming Pearls

Codility

CodeEval

Pramp

Cracking the Coding Interview

Geeks For Geeks

Toptal

https://github.com/juchem/prep

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