Compilare: user.cpp:159:2: warning: no newline at end of file user.cpp: In function 'void solve()': user.cpp:96: warning: operation on 'n2' may be undefined user.cpp:60: warning: unused variable 'j' user.cpp: In function 'int main()': user.cpp:146: warning: operation on 'l2' may be undefined user.cpp:147: warning: operation on 'c1' may be undefined user.cpp:152: warning: operation on 'l2' may be undefined user.cpp:153: warning: operation on 'c1' may be undefined