Compilare: main.c: In function 'main': main.c:5:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("cd.in","r",stdin),freopen("cd.out","w",stdout),scanf("%d%d",&n,&s),t=s/n; ^~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:32: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("cd.in","r",stdin),freopen("cd.out","w",stdout),scanf("%d%d",&n,&s),t=s/n; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:61: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("cd.in","r",stdin),freopen("cd.out","w",stdout),scanf("%d%d",&n,&s),t=s/n; ^~~~~~~~~~~~~~~~~~~ main.c:7:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",y+i,c+i),v[c[i]]+=y[i]; ^~~~~~~~~~~~~~~~~~~~~