View Compilation Error

0_0_2990253_140.cpp:6: error: `_int64' does not name a type
0_0_2990253_140.cpp:8: error: `_int64' does not name a type
0_0_2990253_140.cpp: In function `int main()':
0_0_2990253_140.cpp:26: error: `e' undeclared (first use this function)
0_0_2990253_140.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2990253_140.cpp:33: error: `f' undeclared (first use this function)