2900.js

/** ------------------------------------------------------------------------------
 * 
 * 2900. Longest Unequal Adjacent Groups Subsequence I
 * Topics: Array, DP
 * https://leetcode.com/problems/longest-unequal-adjacent-groups-subsequence-i/description/?envType=daily-question&envId=2025-05-15
 * 
 ------------------------------------------------------------------------------ */
var getLongestSubsequence = function (words, groups) {
  const result = []
  const n = words.length

  result.push(words[0])

  for (let i = 1; i < n; i++) {
    if (groups[i] !== groups[i - 1]) {
      result.push(words[i])
    }
  }

  return result
}

console.log(getLongestSubsequence(["e", "a", "b"], [0, 0, 1]))