coding_drills / art_eQt4aksG5So

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{"kind": "coding_drills", "role_id": "role_ZFn8f3TfBEQ", "source": "leetcode_graphql", "generated_at": "2026-05-20T23:06:18.913065+00:00", "difficulty_mix": {"Easy": 3, "Medium": 5, "Hard": 2}, "topics_filter": [], "questions": [{"index": 0, "category": "coding_array", "question": "[Easy] LC #14 \u00b7 Longest Common Prefix \u2014 solve on leetcode.com", "why": "Topic tags: array, string, trie. AC rate 47.6%. Open the editor at https://leetcode.com/problems/longest-common-prefix/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "longest-common-prefix", "frontend_id": "14", "difficulty": "Easy", "ac_rate": 47.5629941623571, "topics": ["array", "string", "trie"], "url": "https://leetcode.com/problems/longest-common-prefix/"}}, {"index": 1, "category": "coding_array", "question": "[Easy] LC #1 \u00b7 Two Sum \u2014 solve on leetcode.com", "why": "Topic tags: array, hash-table. AC rate 57.5%. Open the editor at https://leetcode.com/problems/two-sum/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "two-sum", "frontend_id": "1", "difficulty": "Easy", "ac_rate": 57.49451107379435, "topics": ["array", "hash-table"], "url": "https://leetcode.com/problems/two-sum/"}}, {"index": 2, "category": "coding_array", "question": "[Easy] LC #26 \u00b7 Remove Duplicates from Sorted Array \u2014 solve on leetcode.com", "why": "Topic tags: array, two-pointers. AC rate 62.8%. Open the editor at https://leetcode.com/problems/remove-duplicates-from-sorted-array/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "remove-duplicates-from-sorted-array", "frontend_id": "26", "difficulty": "Easy", "ac_rate": 62.81073341805187, "topics": ["array", "two-pointers"], "url": "https://leetcode.com/problems/remove-duplicates-from-sorted-array/"}}, {"index": 3, "category": "coding_array", "question": "[Medium] LC #34 \u00b7 Find First and Last Position of Element in Sorted Array \u2014 solve on leetcode.com", "why": "Topic tags: array, binary-search. AC rate 48.9%. Open the editor at https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "find-first-and-last-position-of-element-in-sorted-array", "frontend_id": "34", "difficulty": "Medium", "ac_rate": 48.88231611755927, "topics": ["array", "binary-search"], "url": "https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/"}}, {"index": 4, "category": "coding_array", "question": "[Medium] LC #40 \u00b7 Combination Sum II \u2014 solve on leetcode.com", "why": "Topic tags: array, backtracking. AC rate 59.5%. Open the editor at https://leetcode.com/problems/combination-sum-ii/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "combination-sum-ii", "frontend_id": "40", "difficulty": "Medium", "ac_rate": 59.45810023358465, "topics": ["array", "backtracking"], "url": "https://leetcode.com/problems/combination-sum-ii/"}}, {"index": 5, "category": "coding_array", "question": "[Medium] LC #36 \u00b7 Valid Sudoku \u2014 solve on leetcode.com", "why": "Topic tags: array, hash-table, matrix. AC rate 64.5%. Open the editor at https://leetcode.com/problems/valid-sudoku/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "valid-sudoku", "frontend_id": "36", "difficulty": "Medium", "ac_rate": 64.51813707093162, "topics": ["array", "hash-table", "matrix"], "url": "https://leetcode.com/problems/valid-sudoku/"}}, {"index": 6, "category": "coding_string", "question": "[Medium] LC #6 \u00b7 Zigzag Conversion \u2014 solve on leetcode.com", "why": "Topic tags: string. AC rate 54.1%. Open the editor at https://leetcode.com/problems/zigzag-conversion/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "zigzag-conversion", "frontend_id": "6", "difficulty": "Medium", "ac_rate": 54.14266668360879, "topics": ["string"], "url": "https://leetcode.com/problems/zigzag-conversion/"}}, {"index": 7, "category": "coding_array", "question": "[Medium] LC #15 \u00b7 3Sum \u2014 solve on leetcode.com", "why": "Topic tags: array, two-pointers, sorting. AC rate 39.1%. Open the editor at https://leetcode.com/problems/3sum/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "3sum", "frontend_id": "15", "difficulty": "Medium", "ac_rate": 39.07790477521536, "topics": ["array", "two-pointers", "sorting"], "url": "https://leetcode.com/problems/3sum/"}}, {"index": 8, "category": "coding_array", "question": "[Hard] LC #37 \u00b7 Sudoku Solver \u2014 solve on leetcode.com", "why": "Topic tags: array, hash-table, backtracking, matrix. AC rate 65.5%. Open the editor at https://leetcode.com/problems/sudoku-solver/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "sudoku-solver", "frontend_id": "37", "difficulty": "Hard", "ac_rate": 65.47220302782839, "topics": ["array", "hash-table", "backtracking", "matrix"], "url": "https://leetcode.com/problems/sudoku-solver/"}}, {"index": 9, "category": "coding_string", "question": "[Hard] LC #10 \u00b7 Regular Expression Matching \u2014 solve on leetcode.com", "why": "Topic tags: string, dynamic-programming, recursion. AC rate 31.0%. Open the editor at https://leetcode.com/problems/regular-expression-matching/, talk through your approach, then sketch the algorithm here (whiteboard) or write a plain-English solution (typed).", "how_to_prepare": "Clarify constraints, propose a brute-force, refine to an optimal time/space, walk through 2 example inputs (including an edge case), then trace your final code by hand.", "leetcode": {"title_slug": "regular-expression-matching", "frontend_id": "10", "difficulty": "Hard", "ac_rate": 30.95323848106803, "topics": ["string", "dynamic-programming", "recursion"], "url": "https://leetcode.com/problems/regular-expression-matching/"}}]}