View Compilation Error

0_0_22722382_27107.c:3:1: error: expected identifier or '(' before '/' token
 //#pragma GCC optimize ("O2")
 ^
0_0_22722382_27107.c:3:3: error: stray '#' in program
 //#pragma GCC optimize ("O2")
   ^
0_0_22722382_27107.c:7:3: error: stray '#' in program
 //#include "testlib.h"
   ^
0_0_22722382_27107.c:9:22: fatal error: functional: No such file or directory
 #include <functional>
                      ^
compilation terminated.