1
var equationsPossible = function (equations) {
2
  const A = "a".charCodeAt(0);
3
  const n = equations.length;
4
  const parent = new Array(26).fill(0).map((_, i) => i++);
5

6
  const find = (x) => {
7
    if (parent[x] === x) {
8
      return x;
9
    } else {
10
      return (parent[x] = find(parent[x]));
11
    }
12
  };
13

14
  for (const eq of equations) {
15
    if (eq.charAt(1) === "=") {
16
      parent[find(eq.charCodeAt(0) - A)] = find(eq.charCodeAt(3) - A);
17
    }
18
  }
19

20
  for (const eq of equations) {
21
    if (
22
      eq.charAt(1) === "!" &&
23
      find(eq.charCodeAt(0) - A) === find(eq.charCodeAt(3) - A)
24
    ) {
25
      return false;
26
    }
27
  }
28

29
  return true;
30
};