[LeetCode] Handshakes That Don't Cross

1259. Handshakes That Don’t Cross You are given an even number of people numPeople that stand around a circle and each person shakes hands with someone else so that there are numPeople / 2 handshakes total. Return the number of ways these handshakes could occur such that none of the handshakes cross. Since the answer could be very large, return it modulo 109 + 7. ...

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