https://codeforces.me/contest/1581/problem/A
what is the logic ?? i just know the ans is (2*n)!/2 ,but how ?
HELP IN CODEFORCES ROUND 745 div 2
https://codeforces.me/contest/1581/problem/A
what is the logic ?? i just know the ans is (2*n)!/2 ,but how ?
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