LeetCode 496. Next Greater Element I

/**
 * @param {number[]} findNums
 * @param {number[]} nums
 * @return {number[]}
 */
var nextGreaterElement = function(findNums, nums) {
    let arr = [];
    let flag = false;
    for (let i=0; i<findNums.length; i++) {
        aaa:
           for (let j=0; j<nums.length; j++) {
            if (findNums[i]===nums[j]) {
                for (let k = j+1; k < nums.length; k++) {
                    if(nums[j]<nums[k]) {
                        arr.push(nums[k]);
                        flag = false;
                        break aaa;
                    }
                }
            }else {
                flag = true;
            }
        } 
        if (flag) {
            arr.push(-1);
        }
    }
    return arr;
};