void downToUpInsert(IPuzzleLayer layer)
{
for (var i = 0; i < layers.Count; ++i)
{
var L = layers[i];
if (layer.GetPiecesCount() > L.GetPiecesCount()) // 比這層大，就插入
{
layers.Insert(i, layer);
return;
}
}
layers.Insert(layers.Count, layer);
}
void upToDownInsert(IPuzzleLayer layer)
{
var startIndex = layers.Count - 1;
for (var i = startIndex; i >= 0; --i)
{
var L = layers[i];
if (layer.GetPiecesCount() <= L.GetPiecesCount()) // 比這層小，就插入
{
var insetIndex = i + 1;
layers.Insert(insetIndex, layer);
return;
}
}
//比所有的都大
var head = 0;
layers.Insert(head, layer);
}