219

// Contains Duplicate II
/**
 * @param {number[]} nums
 * @param {number} k
 * @return {boolean}
 */
var containsNearbyDuplicate = function (nums, k) {
    for (let i = 0; i < nums.length; i++) {
        for (let j = 0; j < nums.length; j++) {
            if (nums[i] === nums[j] && Math.abs(i - j) <= k && i < j) {
                return true;
            }
        }
    }
    return false;
};