題目

Given an array of integers nums and a positive integer k, check whether it is possible to divide this array into sets of k consecutive numbers.

Return true if it is possible. Otherwise, return false.

Example 1:

Input: nums = [1,2,3,3,4,4,5,6], k = 4
Output: true
Explanation: Array can be divided into [1,2,3,4] and [3,4,5,6].

Example 2:

Input: nums = [3,2,1,2,3,4,3,4,5,9,10,11], k = 3
Output: true
Explanation: Array can be divided into [1,2,3] , [2,3,4] , [3,4,5] and [9,10,11].

Example 3:

Input: nums = [1,2,3,4], k = 3
Output: false
Explanation: Each array should be divided in subarrays of size 3.

Constraints:

  • 1 <= k <= nums.length <= 100000
  • 1 <= nums[i] <= 1000000000

題目大意

給你一個整數數組 nums 和一個正整數 k，請你判斷是否可以把這個數組劃分成一些由 k 個連續數字組成的集合。 如果可以，請返回 true；否則，返回 false。

解題思路

貪心算法

  • 對nums升序排序
  • 對nums內數字進行哈希計數（key:數字，value:數量）
  • 遍歷nums中的數字，以數量大於1的數字作為連續數字開頭，尋找連續數字後續元素，若無法找到 k 個連續數字則返回false
  • 所有數字都能找到 k 個連續數字返回true

##代碼

package leetcode

import "sort"

func isPossibleDivide(nums []int, k int) bool {
	mp := make(map[int]int)
	for _, v := range nums {
		mp[v] += 1
	}
	sort.Ints(nums)
	for _, num := range nums {
		if mp[num] == 0 {
			continue
		}
		for diff := 0; diff < k; diff++ {
			if mp[num+diff] == 0 {
				return false
			}
			mp[num+diff] -= 1
		}
	}
	return true
}

e }

## 參考代碼

```go
package leetcode

import "sort"

func isPossibleDivide(nums []int, k int) bool {
	mp := make(map[int]int)
	for _, v := range nums {
		mp[v] += 1
	}
	sort.Ints(nums)
	for _, num := range nums {
		if mp[num] == 0 {
			continue
		}
		for diff := 0; diff < k; diff++ {
			if mp[num+diff] == 0 {
				return false
			}
			mp[num+diff] -= 1
		}
	}
	return true
}