Compilare: user.cpp: In function ‘int main()’: user.cpp:32:29: warning: unused variable ‘distance’ [-Wunused-variable] int back_side, front_side, distance = 0; ^~~~~~~~ user.cpp:16:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &s); ^ user.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^