Compilare: main.c: In function 'main': main.c:24:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate2.in","r",stdin),freopen("patrate2.out","w",stdout),scanf("%d",&n),x[1]=y[1]=z[1]=x[0]=y[0]=z[0]=1,R(y,2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:24:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate2.in","r",stdin),freopen("patrate2.out","w",stdout),scanf("%d",&n),x[1]=y[1]=z[1]=x[0]=y[0]=z[0]=1,R(y,2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:24:70: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate2.in","r",stdin),freopen("patrate2.out","w",stdout),scanf("%d",&n),x[1]=y[1]=z[1]=x[0]=y[0]=z[0]=1,R(y,2); ^~~~~~~~~~~~~~