# LeetCode 117Populating Next Right Pointers in Each Node II

## LeetCode 117 Populating Next Right Pointers in Each Node II Problem

``````# Definition for binary tree with next pointer.
#     def __init__(self, x):
#         self.val = x
#         self.left = None
#         self.right = None
#         self.next = None

class Solution(object):
# def connect(self, root):
#     """
#     :rtype: nothing
#     """
# level by level
#     if root is None:
#         return
#     nodes = [root]
#     while len(nodes) != 0:
#         next_step = []
#         last = None
#         for node in nodes:
#             if last is not None:
#                 last.next = node
#             if node.left is not None:
#                 next_step.append(node.left)
#             if node.right is not None:
#                 next_step.append(node.right)
#             last = node
#         nodes = next_step

def connect(self, root):
# https://discuss.leetcode.com/topic/28580/java-solution-with-constant-space
while root is not None:
if root.left is not None:
pre.next = root.left
pre = pre.next
if root.right is not None:
pre.next = root.right
pre = pre.next
root = root.next
if root is None:

``````

## List of all Populating Next Right Pointers in Each Node II problems

Leetcode 117 Populating Next Right Pointers in Each Node II problem solution in python3 with explanation. This is the best place to expand your knowledge and get prepared for your next interview.

self.val = x

self.left = None

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