Compilare: main.cpp: In function 'std::vector<int> calc(std::vector<int>, bool)': main.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) { ~~^~~~~~~~~~ main.cpp:42:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < l.size(); i++) { ~~^~~~~~~~~~