You are given an integer array nums of size n and a positive integer k.
Divide the array into one or more arrays of size 3 satisfying the following conditions:
Each element of nums should be in exactly one array.
The difference between any two elements in one array is less than or equal to k.
Return a 2D array containing all the arrays. If it is impossible to satisfy the conditions, return an empty array. And if there are multiple answers, return any of them.
中文翻譯
給予你一個長度為 n 整數陣列 nums 跟一個正整數 k。
將整個陣列分割成一個或多個大小為 3 的陣列,滿足以下的條件:
nums 中的每一個元素都應該要存在一個陣列中
任一陣列中的兩個元素差值必須小於或等於 k。
回傳一個包含了所有陣列的二維陣列,要是沒辦法滿足所有條件,就回傳一個空陣列。
假如有多個答案,回傳任一個即可
範例及題目限制
💡提示 1
嘗試使用貪婪法
💡提示 2
排列整個陣列,並嘗試將3個連續的元素湊為一組
解題思路
在我們的第一次嘗試中,我們先依照提示的將整個陣列排序
再來3個3個一組的來判斷第一個元素跟第三個元素差值是否在 k 以內
要是符合,就將子陣列儲存,反之則回傳空陣列~
C# 解決方案
⚠️方案1
public class Solution {
public int[][] DivideArray(int[] nums, int k) {
Array.Sort(nums);
int[][]res = new int[nums.Length/3][];
int curIdx = 0;
int resCnt = 0;
while(curIdx<nums.Length-1){
if(nums[curIdx+2]-nums[curIdx]>k){
return new int[0][];
}
int[]tmp = nums[curIdx..(curIdx+3)];
res[resCnt] = tmp;
resCnt++;
curIdx+=3;
}
return res;
}
}
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