diff --git a/website/content/ChapterFour/0800~0899/0846.Hand-of-Straights.md b/website/content/ChapterFour/0800~0899/0846.Hand-of-Straights.md
new file mode 100644
index 00000000..f26eb6cc
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@@ -0,0 +1,75 @@
+# [846. Hand of Straights](https://leetcode.com/problems/hand-of-straights/)
+
+## 题目
+
+Alice has some number of cards and she wants to rearrange the cards into groups so that each group is of size groupSize, and consists of groupSize consecutive cards.
+
+Given an integer array hand where hand[i] is the value written on the ith card and an integer groupSize, return true if she can rearrange the cards, or false otherwise.
+
+**Example 1**:
+
+ Input: hand = [1,2,3,6,2,3,4,7,8], groupSize = 3
+ Output: true
+ Explanation: Alice's hand can be rearranged as [1,2,3],[2,3,4],[6,7,8]
+
+**Example 2**:
+
+ Input: hand = [1,2,3,4,5], groupSize = 4
+ Output: false
+ Explanation: Alice's hand can not be rearranged into groups of 4.
+
+**Constraints:**
+
+- 1 <= hand.length <= 10000
+- 0 <= hand[i] <= 1000000000
+- 1 <= groupSize <= hand.length
+
+## 题目大意
+
+Alice 手中有一把牌，她想要重新排列这些牌，分成若干组，使每一组的牌数都是 groupSize ，并且由 groupSize 张连续的牌组成。
+
+给你一个整数数组 hand 其中 hand[i] 是写在第 i 张牌，和一个整数 groupSize 。如果她可能重新排列这些牌，返回 true ；否则，返回 false 。
+
+## 解题思路
+
+贪心算法
+
+- 对hand升序排序
+- 对hand内数字进行哈希计数（key:数字，value:数量）
+- 遍历hand中的数字，以数量大于1的数字作为顺子开头，寻找顺子后续元素，若无法找到完整顺子则返回false
+- 所有数字都能找到完整顺子返回true
+
+##代码
+
+```go
+package leetcode
+
+import "sort"
+
+func isNStraightHand(hand []int, groupSize int) bool {
+ mp := make(map[int]int)
+ for _, v := range hand {
+ mp[v] += 1
+ }
+ sort.Ints(hand)
+ for _, num := range hand {
+ if mp[num] == 0 {
+ continue
+ }
+ for diff := 0; diff < groupSize; diff++ {
+ if mp[num+diff] == 0 {
+ return false
+ }
+ mp[num+diff] -= 1
+ }
+ }
+ return true
+}
+```
+
+
+----------------------------------------------
+
diff --git a/website/content/ChapterFour/0800~0899/0850.Rectangle-Area-II.md b/website/content/ChapterFour/0800~0899/0850.Rectangle-Area-II.md
index 965f4da0..b16e51fe 100755
--- a/website/content/ChapterFour/0800~0899/0850.Rectangle-Area-II.md
+++ b/website/content/ChapterFour/0800~0899/0850.Rectangle-Area-II.md
@@ -295,6 +295,6 @@ func (sat *SegmentAreaTree) updateInTree(treeIndex, left, right, updateLeft, upd
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diff --git a/website/content/ChapterFour/1000~1099/1006.Clumsy-Factorial.md b/website/content/ChapterFour/1000~1099/1006.Clumsy-Factorial.md
index 9b18f127..737ec220 100644
--- a/website/content/ChapterFour/1000~1099/1006.Clumsy-Factorial.md
+++ b/website/content/ChapterFour/1000~1099/1006.Clumsy-Factorial.md
@@ -78,5 +78,5 @@ func clumsy(N int) int {
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