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class Solution {
 
    public static List<Integer> getUnfulfilledCustomers(List<List<Integer>> requests, long totalInventory) {
        int n = requests.size();
        long[][] arr = new long[n][5];
 
        for (int i = 0; i < n; i++) {
            List<Integer> r = requests.get(i);
            arr[i][0] = r.get(0);
            arr[i][1] = r.get(1);
            arr[i][2] = r.get(2);
            arr[i][3] = r.get(3);
            arr[i][4] = r.get(1);
        }
 
        Arrays.sort(arr, (a, b) -> {
            if (a[2] != b[2]) {
                return (int) (b[2] - a[2]);
            }
            return (int) (a[3] - b[3]);
        });
 
        long remainingStock = totalInventory;
 
        for (int i = 0; i < n; i++) {
            if (remainingStock <= 0) {
                break;
            }
 
            int sameBidCount = 0;
            for (int j = i; j < n; j++) {
                if (arr[j][2] == arr[i][2]) {
                    sameBidCount++;
                } else {
                    break;
                }
            }
 
            if (remainingStock < sameBidCount) {
                for (int j = 0; j < remainingStock; j++) {
                    arr[i + j][1]--;
                }
                remainingStock = 0;
                break;
            }
 
            remainingStock -= arr[i][1];
            arr[i][1] = 0;
        }
 
        List<Integer> unfulfilled = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            if (arr[i][1] == arr[i][4]) {
                unfulfilled.add((int) arr[i][0]);
            }
        }
 
        Collections.sort(unfulfilled);
        return unfulfilled;
    }
}

Main.java:3: error: cannot find symbol
    public static List<Integer> getUnfulfilledCustomers(List<List<Integer>> requests, long totalInventory) {
                                                        ^
  symbol:   class List
  location: class Solution
Main.java:3: error: cannot find symbol
    public static List<Integer> getUnfulfilledCustomers(List<List<Integer>> requests, long totalInventory) {
                                                             ^
  symbol:   class List
  location: class Solution
Main.java:3: error: cannot find symbol
    public static List<Integer> getUnfulfilledCustomers(List<List<Integer>> requests, long totalInventory) {
                  ^
  symbol:   class List
  location: class Solution
Main.java:8: error: cannot find symbol
            List<Integer> r = requests.get(i);
            ^
  symbol:   class List
  location: class Solution
Main.java:16: error: cannot find symbol
        Arrays.sort(arr, (a, b) -> {
        ^
  symbol:   variable Arrays
  location: class Solution
Main.java:51: error: cannot find symbol
        List<Integer> unfulfilled = new ArrayList<>();
        ^
  symbol:   class List
  location: class Solution
Main.java:51: error: cannot find symbol
        List<Integer> unfulfilled = new ArrayList<>();
                                        ^
  symbol:   class ArrayList
  location: class Solution
Main.java:58: error: cannot find symbol
        Collections.sort(unfulfilled);
        ^
  symbol:   variable Collections
  location: class Solution
8 errors

Standard output is empty