Compilare: user.cpp: In function ‘void print(std::vector<int>*)’: user.cpp:28:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:49:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ^ user.cpp:45:5: warning: assuming signed overflow does not occur when assuming that (X + c) < X is always false [-Wstrict-overflow] for(i=1;i<N;i++) ^