View Compilation Error

0_0_13666735_3955.cpp: In function 'int main()':
0_0_13666735_3955.cpp:7:5: error: '_int64' was not declared in this scope
     _int64 f[51];
     ^
0_0_13666735_3955.cpp:9:5: error: 'f' was not declared in this scope
     f[0]=1;
     ^