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0046-permutations.java

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import java.util.ArrayList;

import java.util.Arrays;

class Solution {

public List<List<Integer>> permute(int[] nums) {

List<List<Integer>> ans = new ArrayList<>();

function(ans, nums, 0);

return ans;

}

public void function(List<List<Integer>> ans, int[] arr, int start) {

if (start == arr.length) {

List<Integer> list = new ArrayList();

for (int i = 0; i < arr.length; i++) list.add(arr[i]);

ans.add(list);

return;

}

for (int i = start; i < arr.length; i++) {

swap(arr, start, i);

function(ans, arr, start + 1);

swap(arr, start, i);

}

}

public void swap(int[] arr, int a, int b) {

int temp = arr[a];

arr[a] = arr[b];

arr[b] = temp;

}

}