Leetcode Problem 402. Remove K Digits

402. Remove K Digits

Leetcode Solutions

Initialize an empty stack to store the digits of the final number.
Iterate over each digit in the input number.
- If the current digit is smaller than the top of the stack and we still need to remove more digits, pop the stack.
- Push the current digit onto the stack.
If we have not removed k digits after the iteration, remove the remaining digits from the end of the stack.
Convert the stack to a string and remove any leading zeros.
If the resulting string is empty, return '0'. Otherwise, return the string.

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