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merge_sorted_lists.py
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merge_sorted_lists.py
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import json
import sys
# Definition for singly-linked list.
class ListNode(object):
def __init__(self, x):
self.val = x
self.next = None
class Solution(object):
def mergeTwoLists(self, l1, l2):
"""
:type l1: ListNode
:type l2: ListNode
:rtype: ListNode
"""
lead = ListNode(0)
keeper = lead
p = l1
q = l2
while p is not None and q is not None:
if p.val < q.val:
keeper.next = p
p = p.next
else:
keeper.next = q
q = q.next
keeper = keeper.next
while p is not None:
keeper.next = p
p = p.next
keeper = keeper.next
while q is not None:
keeper.next = q
q = q.next
keeper = keeper.next
return lead.next
def stringToListNode(input):
# Generate list from the input
numbers = json.loads(input)
# Now convert that list into linked list
dummyRoot = ListNode(0)
ptr = dummyRoot
for number in numbers:
ptr.next = ListNode(number)
ptr = ptr.next
ptr = dummyRoot.next
return ptr
def listNodeToString(node):
if not node:
return "[]"
result = ""
while node:
result += str(node.val) + ", "
node = node.next
return "[" + result[:-2] + "]"
def main():
import sys
def readlines():
for line in sys.stdin:
yield line.strip('\n')
lines = readlines()
while True:
try:
line = lines.next()
l1 = stringToListNode(line)
line = lines.next()
l2 = stringToListNode(line)
ret = Solution().mergeTwoLists(l1, l2)
out = listNodeToString(ret)
print out
except StopIteration:
break
if __name__ == '__main__':
main()