View Compilation Error

0_0_39307011_2813.cpp: In function 'int main()':
0_0_39307011_2813.cpp:17:5: error: '_int32' was not declared in this scope
   17 |     _int32 numInstances;
      |     ^~~~~~
0_0_39307011_2813.cpp:18:17: error: 'numInstances' was not declared in this scope
   18 |     std::cin >> numInstances;
      |                 ^~~~~~~~~~~~