View Compilation Error

0_0_32767557_16342.cpp: In function 'int main()':
0_0_32767557_16342.cpp:25:9: error: '_int64' was not declared in this scope
         _int64  a_max = INT64_MIN;
         ^
0_0_32767557_16342.cpp:52:17: error: 'a_max' was not declared in this scope
                 a_max = a_max > (_int64)max_n* Re.height ? a_max : (_int64)max_n * Re.height;
                 ^
0_0_32767557_16342.cpp:55:17: error: 'a_max' was not declared in this scope
         cout << a_max << endl;
                 ^