Compilare: user.c: In function ‘main’: user.c:38:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport.in","rt",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:39:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport.out","wt",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:43:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~ user.c:46:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t[i]); ^~~~~~~~~~~~~~~~~