Function negativeMarking

javascript/0287-find-the-duplicate-number.js:199–211

(nums)

};

const negativeMarking = (nums) => {
    for (let i = 0; i < nums.length; i++) {
        /* Time O(N) */
        const curr = Math.abs(nums[i]);

        const isNegative = nums[curr] < 0;
        if (isNegative) return curr;

        nums[curr] *= -1;
    }

    return -1;
};

const restoreToPositiveNumbers = (nums) => {
    for (let i = 0; i < nums.length; i++) {