advent-of-code/12021/01/01_2.awk

# awk -c -f 01_2.awk 01input.txt

BEGIN{
 count = 0
}

{
 a[NR] = $1
}

END{
 for(i=1;i<=length(a)-3;i++){
   x = a[i] + a[i+1] + a[i+2]
   y = a[i+1] + a[i+2] + a[i+3]
   if( y > x )
	count++
 }
 print(count)
}