Grind 75's default plan is eight weeks at eight hours a week, and the tool groups its questions by week: all easy problems first, then mediums, then the hard ones in the last week. Python is a good fit because the weekly budget is tight and short solutions leave time for review. This page gives the default week-by-week order with the Python built-ins each week needs, the idioms that keep solutions short, and how the plan changes with your hours. For the list itself, see our Grind 75 guide; for language questions, our Python interview questions.
How the tool builds your weeks
Each question in the Grind pool has an estimated time, from 15 to 45 minutes. The tool takes questions in priority order until your budget of weeks times hours runs out, counting each estimate at 1.96 times its value to leave room for review. It then orders them by difficulty and fills one week at a time. At the default eight weeks and eight hours, you get 75 questions: 24 easy, 42 medium and 9 hard, none of them Premium. Counts were read from each list's own site data in November 2026. Lists are edited from time to time, so numbers can drift. The weekly groups below are our reproduction of the tool's logic at default settings, which gives exactly 75.
The default weeks with the Python you need
| Week | Questions | Python tools that help |
|---|---|---|
| 1 | 13 easy: Two Sum, Valid Parentheses, Merge Two Sorted Lists, Best Time to Buy and Sell Stock, Valid Palindrome, Invert Binary Tree, Valid Anagram, Binary Search, Flood Fill, LCA of a BST, Balanced Binary Tree, Linked List Cycle, Implement Queue using Stacks | dict for complements, list as a stack, str.isalnum(), Counter; two lists for the queue, moving items only when the output list is empty |
| 2 | 11 easy and 1 medium: First Bad Version, Ransom Note, Climbing Stairs, Longest Palindrome, Reverse Linked List, Majority Element, Add Binary, Diameter of Binary Tree, Middle of the Linked List, Maximum Depth, Contains Duplicate, Maximum Subarray | Counter(note) <= Counter(magazine) (Python 3.10 and later), two variables for Climbing Stairs, len(set(nums)), Kadane's running sum |
| 3 | 8 medium: Insert Interval, 01 Matrix, K Closest Points to Origin, Longest Substring Without Repeating Characters, 3Sum, Level Order Traversal, Clone Graph, Evaluate Reverse Polish Notation | multi-source BFS with deque, heapq.nsmallest(k, points, key=...), a dict of last-seen indexes, int(a / b) for truncating division |
| 4 | 8 medium: Course Schedule, Implement Trie, Coin Change, Product of Array Except Self, Min Stack, Validate BST, Number of Islands, Rotting Oranges | defaultdict(list) plus in-degrees, dict-of-dicts trie, math.inf in the DP table, (value, current_min) tuples on the stack |
| 5 | 8 medium: Search in Rotated Sorted Array, Combination Sum, Permutations, Merge Intervals, LCA of a Binary Tree, Time Based Key-Value Store, Accounts Merge, Sort Colors | bisect_right on each key's timestamp list, a dict-based union-find, sort(key=lambda x: x[0]), three-pointer partition |
| 6 | 9 medium: Word Break, Partition Equal Subset Sum, String to Integer (atoi), Spiral Matrix, Subsets, Right Side View, Longest Palindromic Substring, Unique Paths, Construct Tree from Preorder and Inorder | a set of words, a bitset in one int (bits |= bits << x), clamping to 2**31 - 1, math.comb, a dict of inorder indexes |
| 7 | 7 medium: Container With Most Water, Letter Combinations, Word Search, Find All Anagrams, Minimum Height Trees, Task Scheduler, LRU Cache | itertools.product, a 26-slot count window, leaf trimming with deque, OrderedDict.move_to_end and popitem(last=False) |
| 8 | 9 hard and 1 medium: Kth Smallest in a BST, Minimum Window Substring, Serialize and Deserialize Binary Tree, Trapping Rain Water, Find Median from Data Stream, Word Ladder, Basic Calculator, Maximum Profit in Job Scheduling, Merge k Sorted Lists, Largest Rectangle in Histogram | an iterator over tokens for deserializing, two heaps, wildcard buckets in defaultdict(list), a stack of signs, bisect over end times, (val, i, node) heap tuples, a monotonic stack with a sentinel 0 |
Idioms that keep solutions short
- Evaluate Reverse Polish Notation trips many Python users:
//floors, so-7 // 2is-4while the problem wants-3; useint(a / b). - Merge k Sorted Lists:
ListNodehas no ordering, soheapqneeds a tie-breaker index in each tuple. - Find Median from Data Stream:
heapqis a min-heap. Push negated values into the lower half, or, on Python 3.14 and later, use the newheappush_maxandheappop_maxfunctions. LeetCode runs Python 3.14, as LeetCode's help page on language environments listed it on November 11, 2026, but many interview editors run older versions. - Construct Binary Tree from Preorder and Inorder:
inorder.index(x)inside recursion is O(n) per call; build{v: i for i, v in enumerate(inorder)}once. - Time Based Key-Value Store: timestamps arrive in increasing order, so append to a list per key and search with
bisect_right. - Partition Equal Subset Sum: Python's unbounded integers make a bitset of reachable sums one line,
bits |= bits << x, then test bittotal // 2.
Adjusting the plan to your hours
The tool lets you choose up to 26 weeks and up to 40 hours a week. Running its selection rule on other settings gives these sizes:
| Setting | Questions | Easy / Medium / Hard |
|---|---|---|
| 4 weeks at 8 hours | 41 | 18 / 23 / 0 |
| 4 weeks at 16 hours | 75 | 24 / 42 / 9 |
| 6 weeks at 10 hours | 71 | 24 / 38 / 9 |
| 8 weeks at 5 hours | 50 | 22 / 24 / 4 |
| 8 weeks at 8 hours (default) | 75 | 24 / 42 / 9 |
| 12 weeks at 8 hours | 111 | 31 / 68 / 12 |
Hard problems rank lower in the tool's priority order, so short settings leave them out: a four-week plan at eight hours has none; add Trapping Rain Water and Merge k Sorted Lists by hand. Longer settings draw on the full pool of 169, explained in our Grind 169 guide. If you already solved the Blind 75 in Python, about half of the default 75 will be repeats.
Turning a list into interview skill
Any list only helps if the practice transfers to problems you have not seen. These habits make the difference:
- Time-box every attempt: about 25 minutes for a medium before you read a solution.
- Keep a log with one line per problem: the pattern, the key idea and the complexity.
- Redo failed problems after three days, a week and three weeks, without looking at your old code.
- Explain your approach out loud before and while you code, as you would to an interviewer.
- In the last two weeks, switch to unseen problems without topic labels.
The patterns most lists are built on are explained in array and string patterns and tree, graph and recursion patterns.
Where CoPilot Interview fits
Finishing a list is not the same as passing an interview: interviewers score how you explain your approach, your trade-offs and your complexity out loud. CoPilot Interview is an AI interview assistant; its free AI mock interview asks coding questions, listens to your spoken explanation and scores it out of ten with a model answer, which is the part a problem list cannot train. The free plan gives 15 minutes a day of live help in sessions of up to 15 minutes, with AI mock interviews included. Online assessments and live coding rounds usually forbid outside help, so practice now and follow your employer's rules on the day.
Disclosure: CoPilot Interview is our product, so weigh what we say about it accordingly.
Frequently asked questions
How many weeks is Grind 75?
Eight by default, at eight hours a week. The tool accepts up to 26 weeks and up to 40 hours a week and resizes the list to fit.
Is Grind 75 good for Python?
Yes. Python's built-ins keep most solutions short, which matters because each week's budget is tight. Watch floor division and heap ordering.
Why are all the hard problems in the last week?
At default settings the tool orders the chosen questions by difficulty before splitting them into weeks, so the nine hard problems land in week 8.
Does Grind 75 need LeetCode Premium?
Not at default settings. Premium questions appear only when longer settings pull from the full pool of 169.
Practice this interview before the real one
The AI mock interview builds questions from your resume and the job description, reads them aloud and scores each spoken answer out of 10. Included on the free plan.
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