Compilare: main.cpp: In function 'void inmultire(int)': main.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++i) { ~~^~~~~~~~~~~~ main.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == ans.size() - 1) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void adaug(int)': main.cpp:39:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == ans.size() - 1) ~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void add(int, std::__cxx11::string)': main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ~~^~~~~~~~~~