Practice coding challenges
11 problems
Given an array of integers nums and an integer target, return indices …
Given two strings s and t, return true if t is an …
Given an integer array nums, return true if any value appears at …
Return index of first non-repeating character, else -1.
Return unique intersection in sorted order.
Determine if n is a happy number.
Return intersection with multiplicity in sorted order.
Check if a partially filled sudoku board is valid.
Return top k frequent numbers sorted ascending by value in ties.
Count contiguous subarrays that sum to k.
Return length of the longest consecutive elements sequence.