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    Nowhere in the problem statement does it say that time must be an integer for a solution to be accepted. However it seems the solution assumes this since the testcase: 21 6 47 3 has a meeting point at the integer 71 but a non-integer time and is meant to return "NO".

    How to report this? This should either return "YES" as the solution, or it should be made clear that the solution should also be for integer time.