Exercise

Recently single?

A prize might be awarded to a single laureate or to several. For each prize category, report the most recent year that a single laureate -- rather than several -- received a prize in that category.

Instructions

100 XP

Specify an index model index_model to pass to db.prizes.create_index that speeds up finding prizes by category and sorting results by decreasing year. That is, the model should index first on category (ascending) and second on year (descending).
Save a string report for printing the last single-laureate year for each distinct category, one category per line. To do this, for each distinct prize category, find the latest-year prize of that category with a laureate share of "1".

Take Hint (-30 XP)