So I had proposed a problem few months back but didn't get the time to prepare an entire contest. Wanted to share the problem and it's editorial which I wrote while proposing.
Came across something similar while reading and implementing a research paper.
Problem statement
Constraints
Example
Editorial
Problem Origin: equation number 2 in the paper "Exploring Nearest Neighbor Approaches for Image Captioning"
Hope you enjoy solving the problem :)
also let me know what difficulty you think should be assigned to this problem.