Compilare: user.cpp: In function ‘int main()’: user.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) ^ user.cpp:46:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1; j<v[q].size(); j++) ^ user.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[q].size();j++) ^ user.cpp:80:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[0].size(); i++) ^