Compilare: main.c: In function 'main': main.c:27:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("sir4.in","r",stdin),freopen("sir4.out","w",stdout),scanf("%llu%llu%llu%llu%llu\n",&y,&a,&b,&m,&q); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:27:31: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("sir4.in","r",stdin),freopen("sir4.out","w",stdout),scanf("%llu%llu%llu%llu%llu\n",&y,&a,&b,&m,&q); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:27:62: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("sir4.in","r",stdin),freopen("sir4.out","w",stdout),scanf("%llu%llu%llu%llu%llu\n",&y,&a,&b,&m,&q); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:34:3: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(s,10005,stdin),u[0]=strlen(s)-1; ^~~~~~~~~~~~~~~~~~~~