View Compilation Error

0_0_23130733_27883.cpp:2:10: error: #include expects "FILENAME" or <FILENAME>
 #include #include #include #include #include #include #include #include using namespace std;
          ^
0_0_23130733_27883.cpp:5:31: error: 'acos' was not declared in this scope
 const long double PI=acos(-1.0);
                               ^
0_0_23130733_27883.cpp:8:1: error: 'set' does not name a type
 set ss;
 ^
0_0_23130733_27883.cpp: In function 'int main()':
0_0_23130733_27883.cpp:42:1: error: 'ss' was not declared in this scope
 ss.clear();
 ^