View Compilation Error

0_0_34633905_8710.c:1:1: error: expected identifier or '(' before '/' token
 //#pragma comment(linker, "/STACK:16777216")
 ^
0_0_34633905_8710.c:1:3: error: stray '#' in program
 //#pragma comment(linker, "/STACK:16777216")
   ^
0_0_34633905_8710.c:2:3: error: stray '#' in program
 //#pragma GCC optimize("-Ofast","-funroll-all-loops")
   ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/_mingw.h:282:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/crtdefs.h:10,
                 from GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:9,
                 from 0_0_34633905_8710.c:3:
GCC4.9.2/x86_64-w64-mingw32/include/vadefs.h:29:11: error: unknown type name '__gnuc_va_list'
   typedef __gnuc_va_list va_list;
           ^
0_0_34633905_8710.c:4:18: fatal error: cstring: No such file or directory
 #include<cstring>
                  ^
compilation terminated.