Compilare: user.cpp: In function ‘int main()’: user.cpp:23:21: warning: unused variable ‘d’ [-Wunused-variable] int x, y, n, l, d, st, dr; ^ user.cpp:21:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.in", "r", stdin); ^ user.cpp:22:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.out", "w", stdout); ^ user.cpp:24:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &x, &y, &n, &l); ^ user.cpp:29:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int d; scanf("%d", &d); ^ user.cpp:47:43: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n%d\n",dr - st, arie(st,dr)); ^ user.cpp:47:43: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized]