Compilare: user.cpp: In function ‘void input()’: user.cpp:18:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &n ) ; ^ user.cpp:21:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &a[ i ] ) ; ^ user.cpp: In function ‘int main()’: user.cpp:68:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "split.in" , "r" , stdin ) ; ^ user.cpp:69:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "split.out" , "w" , stdout ) ; ^ user.cpp: In function ‘void solve()’: user.cpp:36:13: warning: ‘mn’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mx , mn ; ^ user.cpp:36:8: warning: ‘mx’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mx , mn ; ^