Compilare: main.cpp: In function 'bool cmp(std::deque<int>, std::deque<int>)': main.cpp:151:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 151 | for (int i = 0; i < A.size(); ++ i ) { | ~~^~~~~~~~~~