989. Add to Array-Form of Integer

[이벤트(1.226)]

class Solution {

public List<Integer> addToArrayForm(int[] num, int k) {

List<Integer> ret = new ArrayList<>();

String KString = String.valueOf(k);

int kPointer = KString.length() - 1;

int numPointer = num.length - 1;

int counter = 0;

while(kPointer >= 0 || numPointer >= 0 || counter >= 1)

{

int K = 0;

int n = 0;

if(kPointer >= 0) {

K = KString.charAt(kPointer) - '0';

}

if(numPointer >= 0) {

n = num[numPointer];

}

int current = n + K + counter;

counter = current/10;

ret.add(current%10);

kPointer--;

numPointer--;

}

Collections.reverse(ret);

return ret;

}

}

어제랑 똑같네