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("obj.in","r",stdin),freopen("obj.out","w",stdout),scanf("%d",&j); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("obj.in","r",stdin),freopen("obj.out","w",stdout),scanf("%d",&j); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:63: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("obj.in","r",stdin),freopen("obj.out","w",stdout),scanf("%d",&j); ^~~~~~~~~~~~~~ main.c:8:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~