Compilare: user.c: In function ‘main’: user.c:26:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi.in","r",stdin),freopen("triunghi.out","w",stdout),scanf("%d%d",&n,&s),c[0]=1,t=n+1; ^ user.c:26:42: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi.in","r",stdin),freopen("triunghi.out","w",stdout),scanf("%d%d",&n,&s),c[0]=1,t=n+1; ^ user.c:26:75: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi.in","r",stdin),freopen("triunghi.out","w",stdout),scanf("%d%d",&n,&s),c[0]=1,t=n+1; ^