Compilare: user.cpp: In function ‘int main()’: user.cpp:87:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<maxN(); ++i) ^ user.cpp:89:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=i; j<maxN(); ++j) ^ user.cpp:96:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<maxN(); ++i) ^