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LeetCode 77. 组合 #29

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Chocolate1999 opened this issue Sep 18, 2020 · 0 comments
Open

LeetCode 77. 组合 #29

Chocolate1999 opened this issue Sep 18, 2020 · 0 comments
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递归与回溯 LeetCode 递归与回溯专栏

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@Chocolate1999
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仰望星空的人,不应该被嘲笑

题目描述

给定两个整数 n 和 k,返回 1 ... n 中所有可能的 k 个数的组合。

示例:

输入: n = 4, k = 2
输出:
[
  [2,4],
  [3,4],
  [2,3],
  [1,2],
  [1,3],
  [1,4],
]

来源:力扣(LeetCode)
链接:https://leetcode-cn.com/problems/combinations
著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。

解题思路

直接套用组合题解题模板即可

var combine = function (n, k) {
  let res = [];
  let dfs = (t, start) => {
    if (t.length === k) {
      res.push(t);
      return;
    }
    for (let i = start; i <= n; i++) {
      t.push(i);
      dfs(t.slice(), i + 1);
      t.pop();
    }
  }
  dfs([], 1);
  return res;
};

最后

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@Chocolate1999 Chocolate1999 added the 递归与回溯 LeetCode 递归与回溯专栏 label Sep 18, 2020
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