Nhóm Các AnagramGroup Anagrams

function groupAnagrams(strs: string[]): string[][] {
  const groups: string[][] = []
  const visited = new Set<number>()
  for (let i = 0; i < strs.length; i++) {
    if (visited.has(i)) continue
    const group = [strs[i]]
    const sorted = strs[i].split('').sort().join('')
    for (let j = i + 1; j < strs.length; j++) {
      if (visited.has(j)) continue
      if (strs[j].split('').sort().join('') === sorted) {
        group.push(strs[j])
        visited.add(j)
      }
    }
    groups.push(group)
  }
  return groups
}