123456789101112131415161718192021222324252627
function addToArrayForm(A: number[], K: number): number[] {    const res = [];
    let i = A.length - 1, carry = 0;
    while (i >= 0 || K != 0) {        const x = i >= 0 ? A[i] : 0;
        const y = K != 0 ? K % 10 : 0;
        const sum = x + y + carry;
        res.push(sum % 10);
        carry = Math.floor(sum / 10);
        i--;
        K = Math.floor(K / 10);    }    if (carry) {        res.push(carry);    }    return res.reverse();}export default addToArrayForm;