Compilare: user.cpp: In function ‘int main()’: user.cpp:32:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arc.in", "r", stdin); ^ user.cpp:33:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arc.out", "w", stdout); ^ user.cpp:10:40: warning: ‘biggest_first’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j = first; j <= n - (last + 1 - first); j++) ^ user.cpp:36:33: note: ‘biggest_first’ was declared here int max_bile, biggest_last, biggest_first, first, last; ^ user.cpp:83:24: warning: ‘biggest_last’ may be used uninitialized in this function [-Wmaybe-uninitialized] n -= (last - first + 1); ^