AoC Day 9 Part 1 completed

Advent Of Code Day 9-part1.ps1

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+$inputdata=import-csv -header "Number" .\aocd9input.txt
+$inputdata | %{$_.Number = [int64]$_.Number}
+$buffer=25
+$mynumbers=$inputdata[0 .. 24] | select-object -ExpandProperty Number
+for($i=25; $i -lt $inputdata.count; $i++){
+
+    $minval = (($mynumbers|Sort-Object  )[0 .. 1] |measure-object -sum | select-object -ExpandProperty sum)[0]
+    $maxval = (($mynumbers|Sort-Object  )[-2 .. -1] |measure-object -sum | select-object -ExpandProperty sum)[0]
+    $newnum = $inputdata[$i].Number
+    write-host "Prior $($mynumbers[-1]) : $newnum"
+    if($newnum -lt $minval){
+        write-host "ERROR $newnum too low"
+        break
+    }
+    if($newnum -gt $maxval){
+        write-host "ERROR $newnum too high"
+        break
+    }
+    $possiblevalues = @()
+    for($b=0;$b -lt $mynumbers.Count;$b++){
+        $mynum=$mynumbers[$b]
+        for($a=1;$a -lt $mynumbers.count;$a++ ){
+            $nextnum = $mynumbers[$a]
+            if($mynum -eq $nextnum){
+                #write-host "$mynum is same as $nextnum"
+                continue
+            }
+            $possiblevalues += $mynum + $nextnum
+        }
+    }
+    if($possiblevalues -notcontains $newnum){
+        write-host "ERROR $newnum not a sum of prior $buffer numbers"
+        break
+    }
+    $null,$mynumbers=$mynumbers
+    $mynumbers += $newnum
+}