Compilare: main.cpp: In function 'int main()': main.cpp:18:88: warning: comparison of integer expressions of different signedness: 'std::deque<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 18 | while (!concert.empty() && concert.back() < cifre[i] && concert.size() + N - i > M) { | ~~~~~~~~~~~~~~~~~~~~~~~^~~ main.cpp:21:28: warning: comparison of integer expressions of different signedness: 'std::deque<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 21 | if (concert.size() < M) { | ~~~~~~~~~~~~~~~^~~