Compilare: main.cpp: In function 'int main()': main.cpp:32:61: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 32 | while(!stv.empty() && ch>stv.top() && stv.size()+n-i>=m) | ~~~~~~~~~~~~~~^~~ main.cpp:34:22: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 34 | if(stv.size()<n) | ~~~~~~~~~~^~