Compilare: main.cpp: In function 'void divide(int, int)': main.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<s.size();i++) ~^~~~~~~~~ main.cpp:74:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s.size();i++) ~^~~~~~~~~