Compilare: main.c: In function 'main': main.c:14:86: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration] freopen("cerere.in","r",stdin),freopen("cerere.out","w",stdout),scanf("%d\n",&n),gets(s); ^~~~ main.c:14:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("cerere.in","r",stdin),freopen("cerere.out","w",stdout),scanf("%d\n",&n),gets(s); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:36: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("cerere.in","r",stdin),freopen("cerere.out","w",stdout),scanf("%d\n",&n),gets(s); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:69: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("cerere.in","r",stdin),freopen("cerere.out","w",stdout),scanf("%d\n",&n),gets(s); ^~~~~~~~~~~~~~~~ main.c:21:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",a+i,b+i),++w[a[i]],t[b[i]]=a[i]; ^~~~~~~~~~~~~~~~~~~~~ ./ccIr6y8R.o: In function `main': main.c:(.text.startup+0x49): warning: the `gets' function is dangerous and should not be used.