Eroare de compilare: main.cpp: In function 'int main()': main.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:48:31: error: 'c' was not declared in this scope 48 | while(!isEmpty(st) && c > top(st) && nrc - 1 + n - i >= m) { | ^ main.cpp:54:22: error: 'c' was not declared in this scope 54 | push(st, c); | ^ Non zero exit status: 1