summaryrefslogtreecommitdiff
path: root/prolog/problems/trees/deletebt_3/en.py
blob: 215fced0858be0d8304285e4766154f45bc3a323 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
# coding=utf-8

name = 'deleteBT/3'
slug = 'delete an element from a binary tree'

description = '''\
<p><code>deleteBT(X, T, NewT)</code>: the binary tree <code>NewT</code> is obtained from <code>T</code> by deleting one occurence of the element <code>X</code>. If <code>X</code> is not a leaf node, the root of one of its subtrees is moved up. Your code should generate all valid solutions.</p>
<pre>
  ?- deleteBT(1, b(b(b(nil,4,nil),2,b(nil,6,nil)),1,b(nil,3,b(nil,5,nil))), T).
    T = b(b(nil,4,b(nil,6,nil)),2,b(nil,3,b(nil,5,nil))) ;
    T = b(b(b(nil,4,nil),6,nil),2,b(nil,3,b(nil,5,nil))) ;
    T = b(b(b(nil,4,nil),2,b(nil,6,nil)),3,b(nil,5,nil)).
</pre>'''

hint = {}