Compilare: user.cpp: In function ‘int main()’: user.cpp:22:6: warning: unused variable ‘s’ [-Wunused-variable] int s = 0, nr = 0, i = 1, ind = 1; ^ user.cpp: In function ‘bool ok(int)’: user.cpp:54:13: warning: unused variable ‘j’ [-Wunused-variable] int i = 1, j = 1, cti = 1; ^