181881

function solution(arr) {
  var answer = 0;
  let before = [-1];
 
  while (!arr.every((e, idx) => e == before[idx])) {
    before = [...arr];
 
    arr = arr.map((e) => {
      if ((e >= 50) & (e % 2 == 0)) return e / 2;
      if ((e < 50) & (e % 2 != 0)) return e * 2 + 1;
      return e;
    });
    answer++;
  }
  return answer - 1;
}