406. Queue Reconstruction by Height
Suppose you have a random list of people standing in a queue. Each person is described by a pair of integers (h, k), where h is the height of the person and k is the number of people in front of this person who have a height greater than or equal to h. Write an algorithm to reconstruct the queue. Note: The number of people is less than 1,100. Example Input: [[7,0], [4,4], [7,1], [5,0], [6,1], [5,2]] Output: [[5,0], [7,0], [5,2], [6,1], [4,4], [7,1]]
refer to: https://discuss.leetcode.com/topic/60394/easy-concept-with-python-c-java-solution
- Pick out tallest group of people and sort them in a subarray (S). Since there's no other groups of people taller than them, therefore each guy's index will be just as same as his k value.
- For 2nd tallest group (and the rest), insert each one of them into (S) by k value. So on and so forth.
E.g.
input: [[7,0], [4,4], [7,1], [5,0], [6,1], [5,2]]
subarray after step 1: [[7,0], [7,1]]
subarray after step 2: [[7,0], [6,1], [7,1]]
public class Solution { public int[][] reconstructQueue(int[][] people) { //pick up the tallest guy first //when insert the next tall guy, just need to insert him into kth position //repeat until all people are inserted into list Arrays.sort(people,new Comparator<int[]>(){ @Override public int compare(int[] o1, int[] o2){ return o1[0]!=o2[0]? o2[0]-o1[0] : o1[1]-o2[1]; } }); List<int[]> res = new LinkedList<>(); for(int[] cur : people){ res.add(cur[1],cur); } return res.toArray(new int[people.length][]); } }`
res.add(cur[1],cur); linkedList 在指定位置插入 toArray(new Object[0]) 和 toArray() 在功能上是相同的。 所以要用res.toArray(new int[people.length][]);来表示[][]数组啊