View Compilation Error

0_0_16974555_26032.cpp:3:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_16974555_26032.cpp:4:1: error: expected unqualified-id before '<' token
 <set>
 ^
0_0_16974555_26032.cpp: In function 'int main()':
0_0_16974555_26032.cpp:58:1: error: 'set' was not declared in this scope
 set<int>s;
 ^
0_0_16974555_26032.cpp:58:5: error: expected primary-expression before 'int'
 set<int>s;
     ^
0_0_16974555_26032.cpp:79:18: error: 's' was not declared in this scope
 for(i=1;i<=n;i++)s.insert(find(i));
                  ^
0_0_16974555_26032.cpp:82:15: error: 's' was not declared in this scope
 printf("%d\n",s.size()-1);
               ^