add: 221027-CN

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;
+	}
+};

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)