Compilare: main.c: In function 'main': main.c:37:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("java.in","r",stdin),freopen("java.out","w",stdout),scanf("%d",&t); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:37:34: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("java.in","r",stdin),freopen("java.out","w",stdout),scanf("%d",&t); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:37:65: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("java.in","r",stdin),freopen("java.out","w",stdout),scanf("%d",&t); ^~~~~~~~~~~~~~ main.c:39:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&e); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:41:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",a+i,b+i),++w[a[i]]; ^~~~~~~~~~~~~~~~~~~~~