Compilare: main.cpp: In function 'int main()': main.cpp:27:42: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 27 | if(s.top() == 1 and s.size() < n - i) { | ~~~~~~~~~^~~~~~~ main.cpp:36:42: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 36 | if(s.top() == 2 and s.size() < n - i) { | ~~~~~~~~~^~~~~~~ main.cpp:45:42: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 45 | if(s.top() == 3 and s.size() < n - i) { | ~~~~~~~~~^~~~~~~