ACM Preparation

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As ACM ICPC is about to come so everyone starts his/her preparation. There are N distinct competitor’s preparing for ACM ICPC. Each player can make a team up with any other competitor or can even remain single. Ishpreet is also preparing for the same. Being good in maths, he always tries to be mathematical. So he started counting the ways in which N competitors can make a team. A single person ca

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solution.cppC++17

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