0_0_19604525_1112.cpp:2:2: error: expected unqualified-id before numeric constant
2 using namespace std;
^
0_0_19604525_1112.cpp:3:2: error: expected unqualified-id before numeric constant
3 long long f(int n)
^
0_0_19604525_1112.cpp:11:1: error: expected unqualified-id before numeric constant
11 int main()
^
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