Compilare: user.cpp: In function ‘int main()’: user.cpp:58:35: 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:59:37: 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:61:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n", &x, &y, &n, &l); ^ user.cpp:65:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &dir); ^ user.cpp: In function ‘void interior()’: user.cpp:51:9: warning: ‘nn’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j=ni;j<=nn;j++) ^