Compilare: user.c: In function ‘main’: user.c:30:5: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[3000]’ [-Wformat=] scanf("%s",&s); ^ user.c:32:13: warning: unused variable ‘j’ [-Wunused-variable] int i , j; ^ user.c:28:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(in, "r", stdin); ^ user.c:29:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(out, "w", stdout); ^ user.c:30:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&s); ^