[68] 文本左右对齐

/**
 * @param {string[]} words
 * @param {number} maxWidth
 * @return {string[]}
 */
var fullJustify = function (words, maxWidth) {
  const wLen = words.length;
  const ans = [];
  let arr = [];
  let surplus = maxWidth;
  const getString = (array, number) => {
    const aLen = array.length;
    if (aLen === 1) {
      return array[0] + Array(number).fill(' ').join('');
    }
    const yu = number % (aLen - 1);
    const num = (number - yu) / (aLen - 1);
    for (let i = 0; i < yu; i++) {
      array[i] = array[i] + ' ';
    }
    return array.join(Array(num + 1).fill(' ').join(''));
  };
  for (let i = 0; i < wLen; i++) {
    if (surplus - words[i].length > 0) {
      arr.push(words[i]);
      surplus = surplus - words[i].length - 1;
    } else if (surplus - words[i].length === 0) {
      arr.push(words[i]);
      ans.push(arr.join(' '));
      surplus = maxWidth;
      arr = [];
    } else {
      ans.push(getString(arr, surplus + 1));
      arr = [words[i]];
      surplus = maxWidth - words[i].length - 1;
    }
  }
  if (arr.length > 0) {
    ans.push(arr.join(' ') + Array(surplus + 1).fill(' ').join(''));
  }
  return ans;
};