Compilare: user.cpp: In function ‘int main()’: user.cpp:64:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[0][i].size();j++) ^ user.cpp:68:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<q[0][i].size();j++) ^ user.cpp:75:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[1][i].size();j++) ^ user.cpp:79:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<q[1][i].size();j++) ^