View Compilation Error

0_0_16314280_29568.cpp:3:1: error: '_int64' does not name a type
 _int64 a[55];
 ^
0_0_16314280_29568.cpp: In function 'int main()':
0_0_16314280_29568.cpp:7:5: error: 'a' was not declared in this scope
     a[0] = 0;
     ^