Compilare: user.cpp: In function ‘int main()’: user.cpp:72:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:76:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^ user.cpp: In function ‘void debugMode()’: user.cpp:13:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in", "r", stdin); ^ user.cpp:14:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out", "w", stdout); ^ user.cpp: In function ‘int main()’: user.cpp:93:35: warning: ‘start_j’ may be used uninitialized in this function [-Wmaybe-uninitialized] afisare_drum(start_i, start_j); ^ user.cpp:93:35: warning: ‘start_i’ may be used uninitialized in this function [-Wmaybe-uninitialized]