Compilare: user.cpp: In function ‘int sim()’: user.cpp:14:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idx=0;idx<s[i].size();idx++) ^ user.cpp:16:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(idx=0;idx<s[j].size();idx++) ^ user.cpp: In function ‘int main()’: user.cpp:33:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<str.size();i++) ^