Given string num representing a non-negative integer num, and an integer k, return the smallest possible integer after removing k digits from num.
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.
Constraints:
1 <= k <= num.length <= 105numconsists of only digits.numdoes not have any leading zeros except for the zero itself.
function removeKdigits(num: string, k: number): string {
let nums = [...num];
while (k > 0) {
let idx = 0;
while (idx < nums.length - 1 && nums[idx + 1] >= nums[idx]) {
idx++;
}
nums.splice(idx, 1);
k--;
}
return nums.join("").replace(/^0*/g, "") || "0";
}