Compilare: user.cpp: In function ‘int main()’: user.cpp:78:25: warning: unused variable ‘x’ [-Wunused-variable] long int n, t, i, j, s, x, y; ^ user.cpp:78:28: warning: unused variable ‘y’ [-Wunused-variable] long int n, t, i, j, s, x, y; ^ user.cpp: In function ‘int res(int)’: user.cpp:68:8: warning: ‘rez’ may be used uninitialized in this function [-Wmaybe-uninitialized] return rez; ^