Compilare: main.c: In function 'main': main.c:30:27: warning: operation on 't' may be undefined [-Wsequence-point] for(r[++t][++e[t]]=k=i,f[i]=1;i!=p[k];k=p[k],r[t][++e[t]]=k,f[k]=1); ^~~ main.c:45:27: warning: operation on 't' may be undefined [-Wsequence-point] for(r[++t][++e[t]]=k=i,f[i]=1;i!=p[k];k=p[k],r[t][++e[t]]=k,f[k]=1); ^~~ main.c:6:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("cinema.in","r",stdin),freopen("cinema.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:36: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("cinema.in","r",stdin),freopen("cinema.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:69: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("cinema.in","r",stdin),freopen("cinema.out","w",stdout),scanf("%d",&n); ^~~~~~~~~~~~~~ main.c:8:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",p+i); ^~~~~~~~~~~~~~~