Compilare: main.c: In function 'main': main.c:45:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("catun.in","r",stdin),freopen("catun.out","w",stdout),scanf("%d%d%d",&n,&m,&l); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:45:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("catun.in","r",stdin),freopen("catun.out","w",stdout),scanf("%d%d%d",&n,&m,&l); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:45:67: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("catun.in","r",stdin),freopen("catun.out","w",stdout),scanf("%d%d%d",&n,&m,&l); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:49:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x),d[x]=0,h[++k]=x,p[x]=k,b[x]=x; ^~~~~~~~~~~~~~ main.c:51:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&z),A(x,y,z),A(y,x,z); ^~~~~~~~~~~~~~~~~~~~~~~~