From 751db3ab9392fcc256813d50a18702936dfe53d7 Mon Sep 17 00:00:00 2001
From: kazusa <409053122@qq.com>
Date: Mon, 15 Dec 2025 15:30:58 +0800
Subject: [PATCH] =?UTF-8?q?[2110]=20=E8=82=A1=E7=A5=A8=E5=B9=B3=E6=BB=91?=
 =?UTF-8?q?=E4=B8=8B=E8=B7=8C=E9=98=B6=E6=AE=B5=E7=9A=84=E6=95=B0=E7=9B=AE?=
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---
 .../javascript/2110.股票平滑下跌阶段的数目.js | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src/leecode/javascript/2110.股票平滑下跌阶段的数目.js

diff --git a/src/leecode/javascript/2110.股票平滑下跌阶段的数目.js b/src/leecode/javascript/2110.股票平滑下跌阶段的数目.js
new file mode 100644
index 0000000..3195d2a
--- /dev/null
+++ b/src/leecode/javascript/2110.股票平滑下跌阶段的数目.js
@@ -0,0 +1,61 @@
+/*
+ * @lc app=leetcode.cn id=2110 lang=javascript
+ * @lcpr version=
+ *
+ * [2110] 股票平滑下跌阶段的数目
+ */
+
+// @lc code=start
+/**
+ * @param {number[]} prices
+ * @return {number}
+ */
+var getDescentPeriods = function (prices) {
+  // 使用双指针圈定连续的段,当段不连续后,计算连续段所有符合的子段数,重新寻找连续段
+  let [left, right] = [0, 0];
+  let ans = 0;
+  while (right <= prices.length - 1) {
+    if (right == left) {
+      // 重置后的位置
+      right++;
+      continue;
+    }
+    // 不满足连续段
+    if (right >= 1 && prices[right - 1] - prices[right] != 1) {
+      // 找出上一个连续段的个数
+      let num = right - 1 - left + 1;
+      // 计算连续段所有符合的子段数
+      ans += (num * (num + 1)) / 2;
+      // 重置连续段左右指针
+      left = right;
+      continue;
+    }
+    right++;
+  }
+  right = prices.length - 1;
+  // 最后一次计算
+  if (prices[right - 1] - prices[right] != 1) {
+    ans += 1;
+  } else {
+    let num = right - left + 1;
+    ans += (num * (num + 1)) / 2;
+  }
+  return ans;
+};
+getDescentPeriods([3,2,1,4]);
+// @lc code=end
+
+/*
+// @lcpr case=start
+// [3,2,1,4]\n
+// @lcpr case=end
+
+// @lcpr case=start
+// [8,6,7,7]\n
+// @lcpr case=end
+
+// @lcpr case=start
+// [1]\n
+// @lcpr case=end
+
+ */