Longest Path With Different Adjacent Characters

/**
 * @param {number[]} parent
 * @param {string} s
 * @return {number}
 */
var longestPath = function(parent, s) {
     let n = parent.length;
  let ans = 1;
  let distance = new Array(n).fill(0);
  let adj = [];
  for (let i = 0; i < n; i++) {
    adj[i] = new Array();
  }

  for (let i = 1; i < n; i++) {
    adj[parent[i]].push(i);
  }
  console.log(adj);
  const getLongestPath = (source) => {
    distance[source] = 1;

    for (let node of adj[source].values()) {
      getLongestPath(node);
      if (s[source] !== s[node]) {
        ans = Math.max(ans, distance[source] + distance[node]);
        distance[source] = Math.max(
          distance[source],
          distance[node] + 1
        );
      }
    }
  };

  getLongestPath(0);
  return ans;
};