Compilare: user.cpp: In function ‘int main()’: user.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<s.size();i++) ^ user.cpp:29:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i-1]!=' ' && i!=s.size()-1) x[j]++; ^