add: 230502

cpp/2305/LC230502.cpp

@@ -0,0 +1,28 @@
+#include <numeric>
+#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 LC230502 {
+public:
+	static int arraySign(const std::vector<int>&) noexcept;
+};
+
+inline constexpr int sgn(int x) noexcept { return (x >> 31) | !!x; }
+
+int LC230502::arraySign(const std::vector<int>& n) noexcept {
+	return std::reduce(n.begin(), n.end(), 1, [](int x, int y) {
+		return sgn(x) * sgn(y);
+	});
+}

cpp/2305/defs.h

@@ -19,5 +19,9 @@ public:
 	static std::vector<int> powerfulIntegers(int, int, int) noexcept;
 };
 
+class LC230502 {
+public:
+	static int arraySign(const std::vector<int>&) noexcept;
+};
 
 #endif //LEETCODE_CPP_DEFS_H