Compilare: main.cpp: In function 'int main()': main.cpp:20:71: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 20 | while (!stiva.empty() and s[i] > stiva.top() and stiva.size() < m - (n - i + 1)) { | ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~