Compilare: user.cpp: In function ‘bool verify(int, int, int)’: user.cpp:45:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k; ^ user.cpp:45:15: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘int main()’: user.cpp:58:15: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, k, res = 0; ^