Compilare: main.cpp: In function 'int main()': main.cpp:16:77: warning: comparison of integer expressions of different signedness: 'int' and 'std::stack<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | while (!stack.empty() and int(numar[i - 1]) - 48 > stack.top() and n - i >= k - stack.size()) | ~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:19:20: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 19 | if (stack.size() != k) | ~~~~~~~~~~~~~^~~~ main.cpp:6:6: warning: unused variable 'c' [-Wunused-variable] 6 | int c = 0, k, n, nr = 0, i, p = 1; | ^