Compilare: user.c: In function ‘main’: user.c:24:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("party.in","r",stdin),freopen("party.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:24:39: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("party.in","r",stdin),freopen("party.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:24:69: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("party.in","r",stdin),freopen("party.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:26:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&a,&b,&z); ^