PowerShell, (削除) 62 (削除ここまで) (削除) 71 (削除ここまで) 70 bytes
+9 bytes when Test cases with an even number of elements added.
-1 byte with splatting.
for($a=$args;$a[1]-2){$n++;$a=($a|?{++$j%2})+($a|?{$i++%2});rv i,j}+$n
mazzy
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