Compilare: user.cpp: In function ‘int main()’: user.cpp:55:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("compact.in" ,"r", stdin); ^ user.cpp:56:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("compact.out", "w", stdout); ^ user.cpp:57:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:60:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &num[i]); ^ user.cpp: In function ‘int raspund()’: user.cpp:50:19: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] return maxlen - mid + 1; ~~~~~~~^~~~~ user.cpp: In function ‘int main()’: user.cpp:50:19: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] return maxlen - mid + 1; ~~~~~~~^~~~~ user.cpp:42:35: note: ‘mid’ was declared here int start = 1, stop = maxlen, mid; ^~~