node* LCA(node *root, node *n1, node *n2, int &x)
{
int y = 0;
node *temp;

if (root->left) temp = LCA(root->left, n1, n2, y);
x += y;
if (temp != NULL) return temp;
if (x == 2) return node;

if (root->right) temp = LCA(root->right, n1, n2, y);
x += y;
if (temp != NULL) return temp;
if (x == 2) return node;

if (root == e1 || root == e2) x++;
return NULL:
}

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