Compilare: user.cpp: In function ‘int main()’: user.cpp:69:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ^ user.cpp:73:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j+1<v[i].size()) nxt=v[i][j+1]-1; ^ user.cpp:81:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ^