Compilare: main.c: In function 'main': main.c:6:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.in","r",stdin),freopen("rmq.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.in","r",stdin),freopen("rmq.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:63: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.in","r",stdin),freopen("rmq.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~ main.c:8:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]),b[i][0]=i,c[i+1]=c[(i+1)/2]+1; ^~~~~~~~~~~~~~~~~ main.c:13:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y),k=c[y-x+1],printf("%d\n",a[N(b[x-1][k],b[y-(1<<k)][k])]); ^~~~~~~~~~~~~~~~~~~