I’m not sure where to report this kind of issue. If it is wrong place, feel free to move this thread to suitable home.
Problem description says
The blank fields are represented by 0s, while test case describes blank fields as -1.
Your browser information:
User Agent is:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36 Edg/84.0.522.52.
Link to the challenge: