数组排序问题-Codewars Kata“组织巡回锦标赛”

Question

我正在尝试执行此Kata-https://www.codewars.com/kata/organize-a-round-robin-tournament/train/javascript。

任务是创建一个组织循环赛的功能。

示例：

buildMatchesTable(4)

应返回如下矩阵：

[
  [[1,2], [3, 4]],  // first round:  1 vs 2, 3 vs 4
  [[1,3], [2, 4]],  // second round: 1 vs 3, 2 vs 4
  [[1,4], [2, 3]]   // third round:  1 vs 4, 2 vs 3
]

到目前为止，我已经列出了所有可能的匹配，但是我将它们放入正确格式的代码不正确，并抛出错误“无法读取未定义的属性'0'”。

我将不胜感激。谢谢你。

function buildMatchesTable(numberOfTeams) {
  let pairs = [];
  let n = numberOfTeams;
  let arr = [];
  //create all possible pairs without repeating
  for (var i = 1; i <= n; i++){
    for (var j = i+1; j <= n; j++){
      pairs.push([i,j]);  
    }
  }

//not working
for (var i = 0; i < (n-1); i++){
    for (var j = 0; j < pairs.length; j++){
      for (var k = 0; k < 2; k++){
        if (!arr[i][j][k].includes(pairs[j][0]) && !arr[i][j][k].includes(pairs[j][1])){
        arr[i][j].push(pairs[j]);
        pairs.splice(j,1);
        }
      }
    }
  }
}

buildMatchesTable(6)