78 lines
1.7 KiB
Java
78 lines
1.7 KiB
Java
//给定一个不含重复数字的数组 nums ,返回其 所有可能的全排列 。你可以 按任意顺序 返回答案。
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//
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//
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//
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// 示例 1:
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//
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//
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//输入:nums = [1,2,3]
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//输出:[[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]
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//
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//
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// 示例 2:
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//
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//
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//输入:nums = [0,1]
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//输出:[[0,1],[1,0]]
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//
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//
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// 示例 3:
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//
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//
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//输入:nums = [1]
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//输出:[[1]]
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//
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//
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//
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//
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// 提示:
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//
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//
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// 1 <= nums.length <= 6
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// -10 <= nums[i] <= 10
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// nums 中的所有整数 互不相同
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//
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// Related Topics 数组 回溯
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// 👍 1450 👎 0
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package leetcode.editor.cn;
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import java.util.ArrayList;
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import java.util.List;
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//46:全排列
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public class Permutations {
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public static void main(String[] args) {
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//测试代码
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Solution solution = new Permutations().new Solution();
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solution.permute(new int[]{1,2,3});
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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class Solution {
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private List<List<Integer>> list;
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public List<List<Integer>> permute(int[] nums) {
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list = new ArrayList<>();
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dfs(nums, new ArrayList<>());
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return list;
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}
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private void dfs(int[] nums, List<Integer> temp) {
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if (temp.size() == nums.length) {
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list.add(new ArrayList<>(temp));
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return;
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}
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for (int num : nums) {
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if (!temp.contains(num)) {
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temp.add(num);
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dfs(nums, temp);
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temp.remove(temp.size() - 1);
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}
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}
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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} |