text: // Given a list of scores of different students, return the average score of each student's top five scores in the order of each student's id.
  // Each entry items[i] has items[i][0] the student's id, and items[i][1] the student's score.  The average score is calculated using integer division.
  /**
   * @param {number[][]} items
   * @return {number[][]}
   */
  var highFive = function (items) {
      const ids = [];
      const groupBy = {};
      for (let i = 0; i < items.length; i++) {
          const [
              id, score, ] = items[i];
          // 按照id聚合分数
          if (!groupBy[id]) {
              ids.push(id);
              groupBy[id] = [];
          }
          groupBy[id].push(score);
      }
  
      return ids.map((id) => {
          const scores = groupBy[id].sort((a, b) => b - a);
          let sum = 0;
          // 取最高的前五个分数
          for (let i = 0; i < 5; i++) {
              sum += scores[i];
          }
          return [
              id, parseInt(sum / 5), ];
      });
  };
  