Compilare: main.cpp: In function 'int main()': main.cpp:16:20: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 16 | while(st.size()<m) | ~~~~~~~~~^~ main.cpp:20:62: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 20 | while(!st.empty() and s[i]>st.top() and (m-st.size())<(l-i)) | ~~~~~~~~~~~~~^~~~~~ main.cpp:22:25: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 22 | if((m-st.size())==(l-i)) | ~~~~~~~~~~~~~^~~~~~~