Compilare: main.cpp: In function 'int main()': main.cpp:104:32: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 104 | while(stiva.size() > marime && semn(v[stiva[stiva.size()-2]], v[stiva.back()], v[i]) == -1) | ~~~~~~~~~~~~~^~~~~~~~