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Most of the peope solved this problem but time complexity of solution is O(n*m) (due to two nested for loops)which can not be used to solve this problem for given time constraint, so you need better approach which beats O(n*m)
I have created a video tutorial for you and uploaded the same on youtube with complete explanation along with code complexity analysis.
Here is the video tutorial for my solution O(n+m) complexity passed all test cases.
Would really appreciate your feedback like, dislike , comment etc. on my video.