def test_create_triangle(self):
root_node = Node(data='a')
left_node = root_node.add_left(data='b')
right_node = root_node.add_right(data='c')
self.assertIs(left_node.parent, right_node.parent)
self.assertIs(left_node.sibling, right_node)
self.assertIs(right_node.sibling, left_node)
self.assertIs(root_node.right, right_node)
self.assertIs(root_node.left, left_node)
def construct_tree(cumsum, l, h):
if h - l < 1:
return
if h - l == 1:
return Node(w[l], 0, f[l])
t = (cumsum[l] + cumsum[h - 1]) // 2
mid = find_balance(cumsum, t, l, h)
root = Node(w[mid], 0, f[mid])
left_sub = construct_tree(cumsum, l, mid)
if left_sub:
root.add_left(left_sub)
right_sub = construct_tree(cumsum, mid + 1, h)
if right_sub:
root.add_right(right_sub)
return root
cost_lookup(tbl_cost, m + 1, j),
sum_lookup(tbl_sum, i, j)
])
if cost < tbl_cost[i][j]:
tbl_cost[i][j] = cost
min_r = m
new_root = Node(w[min_r], min_r, f[min_r])
tbl_root[i][j] = new_root
if min_r - 1 >= i:
left_root = tbl_root[i][min_r - 1]
new_root.add_left(left_root)
if min_r + 1 <= j:
right_root = tbl_root[min_r + 1][j]
new_root.add_right(right_root)
# printTable(tbl_cost)
m_tree = tbl_root[0][l - 1]
assert m_tree.check_invariant()
# print(m_tree.ascii_art())
# printTable(tbl_cost)
total = tbl_sum[0][l - 1]
lst = []
in_order(lst, m_tree, 1)
cumsum = 0
with open("mincostbst_essay.txt", "w") as outfp:
for node, level in lst:
cumsum += node.freq * level / total
