View Compilation Error

0_0_8856246_16467.cpp:16: error: `_int64' does not name a type
0_0_8856246_16467.cpp:18: error: expected `,' or `...' before "a"
0_0_8856246_16467.cpp:19: error: ISO C++ forbids declaration of `_int64' with no type
0_0_8856246_16467.cpp: In function `int cmp(int)':
0_0_8856246_16467.cpp:20: error: `a' undeclared (first use this function)
0_0_8856246_16467.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8856246_16467.cpp:20: error: `b' undeclared (first use this function)
0_0_8856246_16467.cpp: In function `int main()':
0_0_8856246_16467.cpp:29: error: `a' undeclared (first use this function)