Compilare: main.c: In function 'F': main.c:5:8: warning: unused variable 'y' [-Wunused-variable] int r,y; ^ main.c: In function 'main': main.c:13:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.in","r",stdin),freopen("disjoint.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:13:38: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.in","r",stdin),freopen("disjoint.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:13:73: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.in","r",stdin),freopen("disjoint.out","w",stdout),scanf("%d%d",&n,&m); ^~~~~~~~~~~~~~~~~~~ main.c:18:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&z); ^~~~~~~~~~~~~~~~~~~~~~~~