From 5a3a8d32a4ad3408592599225cd5c836717e32eb Mon Sep 17 00:00:00 2001
From: Eatswap <root@eatswap.org>
Date: Thu, 27 Oct 2022 13:47:01 +0800
Subject: [PATCH] add: 221027-CN

---
 cpp/2210/221027-CN.cpp  | 36 ++++++++++++++++++++++++++++++++++++
 cpp/2210/CMakeLists.txt |  2 +-
 2 files changed, 37 insertions(+), 1 deletion(-)
 create mode 100644 cpp/2210/221027-CN.cpp

diff --git a/cpp/2210/221027-CN.cpp b/cpp/2210/221027-CN.cpp
new file mode 100644
index 0000000..2e9c2fe
--- /dev/null
+++ b/cpp/2210/221027-CN.cpp
@@ -0,0 +1,36 @@
+#include <vector>
+
+/**
+ * 1822. Sign of the Product of an Array
+ *
+ * There is a function signFunc(x) that returns:
+ * - 1 if x is positive.
+ * - -1 if x is negative.
+ * - 0 if x is equal to 0.
+ * You are given an integer array nums. Let product be the product of all values in the array nums.
+ * Return signFunc(product).
+ */
+
+class Solution {
+private:
+	static constexpr int sgn(int n) {
+		return n ? ((n >> 31) | 1) : 0;
+	}
+
+public:
+	static int arraySign(const std::vector<int>& nums) {
+		const int MASK = 0xFFFFFFFE, n = nums.size();
+		int ans = sgn(nums[0]);
+		if (!ans)
+			return 0;
+		for (int i = 1; i < n; ++i) {
+			switch (sgn(nums[i])) {
+				case 0:
+					return 0;
+				case -1:
+					ans ^= MASK;
+			}
+		}
+		return ans;
+	}
+};
diff --git a/cpp/2210/CMakeLists.txt b/cpp/2210/CMakeLists.txt
index da71f7a..2bc0125 100644
--- a/cpp/2210/CMakeLists.txt
+++ b/cpp/2210/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2210)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2210 221026.cpp)
+ADD_EXECUTABLE(2210 221027-CN.cpp)