Compilare: user.cpp: In function ‘void input()’: user.cpp:14:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , &n , &m ) ; ^ user.cpp:17:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for ( i = 1 ; i <= n ; i ++ ) { scanf ( "%d" , &x ) ; } ^ user.cpp:20:28: 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:50:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "permutare2.in" , "r" , stdin ) ; ^ user.cpp:51:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "permutare2.out" , "w" , stdout ) ; ^