Compilare: main.cpp: In function 'void solve()': main.cpp:23:27: warning: comparison of integer expressions of different signedness: 'std::deque<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 23 | while(stiva.size()>help && stiva.back()<a) | ~~~~~~~~~~~~^~~~~ main.cpp:25:24: warning: comparison of integer expressions of different signedness: 'std::deque<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 25 | if(stiva.size()<k) | ~~~~~~~~~~~~^~