Hints could be provided to help users incrementally arrive at the desired solution. Users could %load these hints into the **Challenge Notebook** when needed. ## Hints Run the following cell(s) for a hint: ``` %load hint1.txt ``` ``` %load hint2.txt ``` Running the cell(s) would would load the contents of the accompanying hint file: ``` # %load hint1.txt Consider a brute force solution that scans each element and compares it with every other element. ``` ``` # %load hint2.txt The brute force solution has a time complexity of O(n^2). A hash map lookup could help make this linear. ```