Create 1869.cpp

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Kirigaya Kazuto 2016-10-24 17:03:49 +08:00 committed by GitHub
parent 9aeb76975f
commit 8b8404ed3a

11
QUSTOJ/1869.cpp Normal file
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#include <iostream>
using namespace std;
int main()
{
int a;
const double pi=3.14;
cin>>a;
cout<<a*a*pi<<endl;
return 0;
}