Function update

javascript/0494-target-sum.js:211–226

(num, total, tabu, temp)

};

var update = (num, total, tabu, temp) => {
    for (let sum = -total; sum <= total; sum++) {
        /* Time O(M) */
        const isInvalid = tabu[sum + total] <= 0;
        if (isInvalid) continue;

        const dpSum = tabu[sum + total];
        const left = sum + num + total;
        const right = sum - num + total;

        temp[left] += dpSum; /* Space O(M) */
        temp[right] += dpSum; /* Space O(M) */
    }

    return temp;
};