Compilare: main.cpp: In function 'int main()': main.cpp:17:76: warning: comparison of integer expressions of different signedness: 'int' and 'std::stack<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | while (!stack.empty() and int(numar[i - 1]) - 48 > stack.top() and n - i >= k - stack.size()) | ~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:21:20: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 21 | if (stack.size() != k) | ~~~~~~~~~~~~~^~~~