View Compilation Error

0_0_16757600_689.cpp:7:1: error: '_int64' does not name a type
 _int64 pow_mod(_int64 a, _int64 i, _int64 n)
 ^
0_0_16757600_689.cpp:16:11: error: '_int64' was not declared in this scope
 bool test(_int64 n, _int64 a, _int64 d)
           ^
0_0_16757600_689.cpp:16:21: error: '_int64' was not declared in this scope
 bool test(_int64 n, _int64 a, _int64 d)
                     ^
0_0_16757600_689.cpp:16:31: error: '_int64' was not declared in this scope
 bool test(_int64 n, _int64 a, _int64 d)
                               ^
0_0_16757600_689.cpp:16:39: error: expression list treated as compound expression in initializer [-fpermissive]
 bool test(_int64 n, _int64 a, _int64 d)
                                       ^
0_0_16757600_689.cpp:17:1: error: expected ',' or ';' before '{' token
 {
 ^