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Dat-13_Remove_K_Digits.py
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Dat-13_Remove_K_Digits.py
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'''
Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible.
Note:
The length of num is less than 10002 and will be ≥ k.
The given num does not contain any leading zero.
Example 1:
Input: num = "1432219", k = 3
Output: "1219"
Explanation: Remove the three digits 4, 3, and 2 to form the new number 1219 which is the smallest.
Example 2:
Input: num = "10200", k = 1
Output: "200"
Explanation: Remove the leading 1 and the number is 200. Note that the output must not contain leading zeroes.
Example 3:
Input: num = "10", k = 2
Output: "0"
Explanation: Remove all the digits from the number and it is left with nothing which is 0.
'''
class Solution:
def removeKdigits(self, num: str, k: int) -> str:
result = []
if k==0:
return num
if (k>=len(num)):
return '0'
for d in num:
while k and result and result[-1]>d:
result.pop()
k-=1
result.append(d)
return ''.join(result).lstrip('0')[:-k or None] or '0'