Code challenges

LeetCode-style problems. Judge: Judge0 (hosted).

track

Python for SRE — Challenge Set

Small, real-world scripting problems: parse logs, lint commits, read /etc/passwd.

7 challenges

3 minCheck Even or OddDetermine whether a given integer is even or odd.12 minUsers from /etc/passwdParse the classic colon-delimited file and extract real users.12 minCommit message linterEnforce a team's commit convention with ten lines of Python.12 minCount ERROR linesScan a log stream and report how many lines contain ERROR.10 minExtract the log levelSplit a log line and print its severity field.10 minAdd two numbersWarm-up: read two integers from stdin and print their sum.15 minCount non-empty linesSRE-flavored warm-up: count log lines that are not blank.

🔒 paid track

FAANG DSA Track

The eight patterns that show up in nearly every phone screen — hash maps, stacks, sliding windows, sorting sweeps, binary search — as graded problems with hidden tests.

View as playlist →

$39 · 8 challenges

15 min🔒Two SumReturn the indices of the two numbers that add up to the target.15 min🔒Valid ParenthesesDecide whether a string of brackets is properly nested.10 min🔒Reverse Words in a StringReverse the order of words, collapsing extra spaces.20 min🔒Maximum SubarrayLargest sum of any contiguous subarray (Kadane's algorithm).25 min🔒Merge IntervalsMerge all overlapping intervals.15 min🔒Binary SearchFind a target in a sorted array in O(log n).25 min🔒Longest Substring Without Repeating CharactersSliding window over characters.25 min🔒Top K Frequent ElementsReturn the k most frequent values.

🔒 unlock this track

FAANG DSA Track

8 graded challenges with hidden tests. Lifetime access.

$39

Secure payment · receipt by email · refund policy

Or get the All-access pass — every course, lab, track and solution.