Based on 8 reported problems, Nordstrom interviews are in line with industry averages - 13% Hard vs 18% overall. The majority (88%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, Nordstrom puts unusual emphasis on dynamic-programming (37.5% of problems, 1.9x the industry average), hash-table (37.5% of problems, 1.7x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (62.5%), dynamic-programming (37.5%), string (37.5%), hash-table (37.5%). Problems below are sorted by frequency, the ones at the top are asked most often.