Compilare: user.c: In function ‘main’: user.c:11:5: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[2000001]’ [-Wformat=] scanf("%s%s",&a, &b); ^ user.c:11:5: warning: format ‘%s’ expects argument of type ‘char *’, but argument 3 has type ‘char (*)[2000001]’ [-Wformat=] user.c:9:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin); ^ user.c:10:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out","w",stdout); ^ user.c:11:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s",&a, &b); ^