Compilare: user.c: In function ‘sift’: user.c:66:9: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] if (k<<1 +1<=size && d[h[k<<1+1]]<d[h[k<<1]]) ^ user.c:66:9: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] user.c:67:17: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] fiu=k<<1+1; ^ user.c: In function ‘main’: user.c:121:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.c:125:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&a,&b,&c); ^