Compilare: main.cpp: In member function 'void mstack::push(int)': main.cpp:56:23: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 56 | if(st1.size() != mij) | ~~~~~~~~~~~^~~~~~ main.cpp: In member function 'void mstack::pop()': main.cpp:88:23: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 88 | if(st1.size() != mij) | ~~~~~~~~~~~^~~~~~