remove_k_digits.py (805B)
| # 402. Remove K Digits
"""
given string 'num' representing a non-negative integer 'num', and an integer
'k' return the smallest possible integer after removing 'k' digits from
'num'.
"""
class Solution(object):
def removeKdigits(self, num, k):
"""
:type num: str
:type k: int
:rtype: str
"""
stk = list()
for n in num:
while stk and k and stk[-1] > n:
stk.pop()
k -= 1
if stk or n != "0":
stk.append(n)
if k:
stk = stk[0:-k]
return "".join(stk) or "0"
if __name__ == "__main__":
obj = Solution()
print(obj.removeKdigits(num="1432219", k=3))
print(obj.removeKdigits(num="10200", k=1))
print(obj.removeKdigits(num="10", k=2))
|
