Compilare: user.cpp: In function ‘int main()’: user.cpp:13:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) S+='#',S+=s[i]; S+="#$"; ^ user.cpp:15:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S.size();i++){ ^ user.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S.size();i++){ ^ user.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S.size();i++) Many+=Add[i]; ^