1
var isPossible = function (nums) {
2
  const need = new Map();
3
  const hash = nums.reduce((map, num) => {
4
    const count = map.get(num) ?? 0;
5
    map.set(num, count + 1);
6
    return map;
7
  }, new Map());
8

9
  for (const num of nums) {
10
    const current = hash.get(num);
11
    if (current === 0) continue;
12

13
    const currentNeed = need.get(num);
14
    const next1 = hash.get(num + 1);
15
    const next2 = hash.get(num + 2);
16
    if (currentNeed > 0) {
17
      const need1 = need.get(num + 1) ?? 0;
18
      need.set(num, currentNeed - 1);
19
      need.set(num + 1, need1 + 1);
20
    } else if (next1 > 0 && next2 > 0) {
21
      const need3 = need.get(num + 3) ?? 0;
22
      hash.set(num + 1, next1 - 1);
23
      hash.set(num + 2, next2 - 1);
24
      need.set(num + 3, need3 + 1);
25
    } else {
26
      return false;
27
    }
28
    hash.set(num, current - 1);
29
  }
30
  return true;
31
};