struct node {
itemType key;
dataType daten;
node *l, *r;
node(itemType schluessel, dataType data, node *links, node *rechts) {
key = schluessel;
daten = data;
l = links;
r = rechts;
};
};
node *z = new node(0, keineDaten, 0, 0);
node *head = new node(minKey, 0, 0, z);
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