Compilare: main.c: In function 'citire': main.c:7:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("dfs.in","r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:8:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("dfs.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^~~~~~~~~~~~~~~~~~~~ main.c:13:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^~~~~~~~~~~~~~~~~~~~