View Compilation Error

0_0_32897871_4115.cpp: In function 'long long int query(int)':
0_0_32897871_4115.cpp:29:2: error: '_int64' was not declared in this scope
  _int64 res = 0;
  ^
0_0_32897871_4115.cpp:32:3: error: 'res' was not declared in this scope
   res += a[x];
   ^
0_0_32897871_4115.cpp:35:9: error: 'res' was not declared in this scope
  return res;
         ^