View Compilation Error

0_0_17203275_20415.cpp:2:1: error: '__int64' does not name a type
 __int64 ans[N];
 ^
0_0_17203275_20415.cpp:3:10: error: variable or field 'dfs' declared void
 void dfs(__int64 sum,int c1,int c2)
          ^
0_0_17203275_20415.cpp:3:10: error: '__int64' was not declared in this scope
0_0_17203275_20415.cpp:3:22: error: expected primary-expression before 'int'
 void dfs(__int64 sum,int c1,int c2)
                      ^
0_0_17203275_20415.cpp:3:29: error: expected primary-expression before 'int'
 void dfs(__int64 sum,int c1,int c2)
                             ^
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_17203275_20415.cpp:16:
GCC4.9.2/x86_64-w64-mingw32/include/vadefs.h:12:32: error: expected declaration before end of line
 #pragma pack(push,_CRT_PACKING)
                                ^