Compilare: main.cpp: In member function 'void mstack::push(int)': main.cpp:53:23: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 53 | if(st1.size() != mij) | ~~~~~~~~~~~^~~~~~ main.cpp: In member function 'void mstack::pop()': main.cpp:85:23: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 85 | if(st1.size() != mij) | ~~~~~~~~~~~^~~~~~