Compilare: main.c: In function 'main': main.c:15:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.in","r",stdin),freopen("arbint.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:15:36: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.in","r",stdin),freopen("arbint.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:15:69: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.in","r",stdin),freopen("arbint.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~ main.c:18:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",c+i); ^~~~~~~~~~~~~~~ main.c:22:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&i,&a,&b); ^~~~~~~~~~~~~~~~~~~~~~~~