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Sandboxed coding rounds that run against a hidden test suite, and written questions graded against a rubric — side by side, because when you are drilling a topic you want both.

3 questions · browse by bank instead

• Contains DuplicateWrite `has_duplicate(nums)` that returns `True` when any value appears more than once in the list, and `False` when every value is distinct. has_duplicate([1, 2, 3, 1]) -> True has_duplicateasyCoderpad#arrays-hashing#implementation
• Two SumWrite `two_sum(nums, target)` that returns the indices of the two values summing to `target`, as a tuple `(i, j)` with `i < j`. Exactly one such pair exists. two_sum([2, 7, 11, 15], 9) -> (0, 1easyCoderpad#arrays-hashing#implementation
• Valid AnagramWrite `is_anagram(a, b)` that returns `True` when the two strings contain exactly the same characters with the same multiplicities. is_anagram("listen", "silent") -> True is_anagram("rat", easyCoderpad#arrays-hashing#implementation