#402
Remove K Digits
expert · 1050 · lc medium +32 · verified · 36.4% accepted · 10,540 likes · top 14%
Description
Given a string num representing a non-negative integer and an integer k, remove exactly k digits from num so that the remaining digits form the numerically smallest possible integer. Return the result as a string without leading zeros (returning "0" when the result is 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.
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