Compilare: user.cpp: In function ‘int main()’: user.cpp:15:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=s.size();i++) ^ user.cpp:41:28: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s[i-1]==' ' and (s[i-2]==')' || s[i-2]==' ')|| s[i-1]==')') ^