https://mirror.codeforces.com/contest/1296/submission/330147535
this is my solution using dictionary in python3.
maybe, there could be a lot of positions in 2D with collisions.
Why no one hack dictionary of python3 in this problem?
https://mirror.codeforces.com/contest/1296/submission/330147535
this is my solution using dictionary in python3.
maybe, there could be a lot of positions in 2D with collisions.
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