Compilare: main.cpp: In function 'int main()': main.cpp:21:72: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 21 | while (!st.empty() && st.top() < s[i] && st.size() + n - i - 1 >= m) | ~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp:23:23: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 23 | if (st.size() < m) | ~~~~~~~~~~^~~