Compilare: user.cpp: In function ‘int solve()’: user.cpp:35:36: warning: unused variable ‘z’ [-Wunused-variable] int k = 0, x, inv, y, ans = 1, z; ^ user.cpp: In function ‘int main()’: user.cpp:79:9: warning: unused variable ‘x’ [-Wunused-variable] int x, inv, y; ^ user.cpp:79:12: warning: unused variable ‘inv’ [-Wunused-variable] int x, inv, y; ^ user.cpp:79:17: warning: unused variable ‘y’ [-Wunused-variable] int x, inv, y; ^