Compilare: user.c: In function ‘Add’: user.c:51:6: warning: implicit declaration of function ‘calloc’ [-Wimplicit-function-declaration] p=calloc(1,sizeof(NOD)); ^ user.c:51:8: warning: incompatible implicit declaration of built-in function ‘calloc’ [enabled by default] p=calloc(1,sizeof(NOD)); ^ user.c: In function ‘Push’: user.c:79:8: warning: incompatible implicit declaration of built-in function ‘calloc’ [enabled by default] p=calloc(1,sizeof(NOD)); ^ user.c: In function ‘Read’: user.c:36:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen( "sortaret.in" , "r", stdin ); ^ user.c:38:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &N, &M ); ^ user.c:42:15: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &X, &Y); ^ user.c: In function ‘Write’: user.c:87:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen( "sortaret.out", "w", stdout ); ^