Compilare: user.cpp: In function ‘int main()’: user.cpp:16:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++)rez+=nrc[s[i]-'0']; ^ user.cpp:39:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^ user.cpp:47:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<s.size();j++) ^