Practice Drills

Let the review queue choose the next problem, or select one when you know the skill you want to isolate. One rep should produce one useful correction, not a larger solve count.

Start in the editor

Choose a comment format in Copilot Chat:

/reacto
/clarp
/umpire
/comments

No arguments are needed. To select a drill, add its topic and name, such as /clarp graphs dijkstra. The direct terminal equivalent is:

just practice-start clarp graphs dijkstra

Fill the comments in your source file, save, and remove the THINKING GATE yourself. Then implement and add cases in your test file. Use /continue or just practice-next for one next instruction.

just practice-test
just practice-repl
just practice-finish "one fix"

Core 43

The core set covers common patterns across sessions. just catalog prints the machine-readable list and current topic counts.

Topic	Problems
Arrays	two_sum, group_anagrams, product_except_self, top_k_frequent
Two pointers	three_sum, trapping_rain_water
Sliding window	min_window_substring, longest_substring_no_repeat
Stacks and queues	valid_parentheses, daily_temperatures
Searching	binary_search, search_rotated_array
Linked lists	reverse_linked_list, lru_cache
Trees	validate_bst, level_order_traversal, trie
Graphs	number_of_islands, topological_sort, course_schedule, dijkstra, a_star_search, bellman_ford, minimum_spanning_tree
Dynamic programming	coin_change, edit_distance, knapsack, longest_increasing_subseq, longest_common_subseq
Heaps	kth_largest, merge_k_sorted_lists
Backtracking	subsets, combination_sum, n_queens
Greedy	merge_intervals, jump_game
Strings	valid_palindrome, longest_palindromic_substring
Recursion	generate_parentheses, flatten_nested_list
Bit manipulation	single_number
Sorting	quickselect
Math	sieve_of_eratosthenes

Choose by the signal you want to improve: restating the problem, selecting an example, recognizing a pattern, implementing cleanly, testing, or explaining complexity. The decision tree helps with pattern selection. Inspect the algorithm library after the rep reaches a natural stopping point.

More practice

The repository includes additional problems in the same topic directories. Any entry from just catalog can start with just practice-start. Use the learning paths when you want a curated order, or Advanced Exercises for code reading and open-ended decomposition.

Untimed conversation and timed board-style reps can use the same catalog. The editor workspace is the default surface, not the only valid one.