Compilare: user.cpp: In function ‘int main()’: user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s[0].size(); ++i) { ^ user.cpp:23:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;poz[j]<s[j].size()-1 && s[j][poz[j]]<s[0][i]; ++poz[j]); ^ user.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<r.size(); ++i) g<<r[i]<<' '; ^