Hello @ameya13
These are details of time taken (minutes:seconds) to submit each problem in order of number of submission of problems:
@mayur2305: 01:17, 01:19, 01:42, 05:05, 03:30
@starkk99: 02:56, 00:49, 07:22, 01:07, 00:57
@maoni: 04:10, 00:41, 05:37, 02:23, 01:40
All three of them completed contest under 15 min, before any clarifications regarding wrong test cases and ambigious statements.
Next and the only guy to do all of the problmes was @hitesh_0301. Took him above an hour.
This surely looks like a case of cheating.