/in/foo.cc: In function 'int main()':
/in/foo.cc:30:25: error: invalid operands of types 'int' and '__gnu_cxx::__promote_2<int, int, double, double>::__type {aka double}' to binary 'operator%'
     Result=binomial(n,k)%(pow(10,9)+7);
            ~~~~~~~~~~~~~^~~~~~~~~~~~~~