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0402-remove-k-digits.adoc

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402. Remove K Digits

{leetcode}/problems/remove-k-digits/[LeetCode - Remove K Digits^]

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.

思路分析

利用单调栈的思路，将前面比当前字符大的字符都删除即可。

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一刷
link:{sourcedir}/_0402_RemoveKDigits.java[role=include]