Compilare: user.c: In function ‘main’: user.c:6:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi2.in","r",stdin),freopen("triunghi2.out","w",stdout),scanf("%d",&n); ^ user.c:6:46: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi2.in","r",stdin),freopen("triunghi2.out","w",stdout),scanf("%d",&n); ^ user.c:6:80: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi2.in","r",stdin),freopen("triunghi2.out","w",stdout),scanf("%d",&n); ^ user.c:8:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d",&u[i],&v[i],&x[i],&y[i],&w[i],&z[i]); ^ user.c:9:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&k,&l); ^