add: 220529 [cpp]

cpp/2205/220529.cpp

@@ -0,0 +1,39 @@
+#include <iostream>
+#include <string>
+#include <vector>
+#include <cstdint>
+
+/**
+ * 318. Maximum Product of Word Lengths
+ * Given a string array words, return the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. If no such two words exist, return 0.
+ */
+
+class Solution {
+public:
+	static int maxProduct(const std::vector<std::string>& words) {
+		const int n = words.size();
+		std::vector<std::pair<uint16_t, uint32_t>> w;
+		w.reserve(n);
+		for (const std::string& s : words) {
+			uint32_t set = 0;
+			for (const char c : s)
+				set |= 1 << (c - 'a');
+			w.emplace_back(s.length(), set);
+		}
+		int ret = 0;
+		for (int i = 0; i < n; ++i) {
+			const auto& [l1, s1] = w[i];
+			for (int j = i + 1; j < n; ++j) {
+				const auto& [l2, s2] = w[j];
+				if (!(s1 & s2))
+					ret = std::max(ret, l1 * l2);
+			}
+		}
+		return ret;
+	}
+};
+
+int main() {
+	std::cout << Solution::maxProduct({"abcw","baz","foo","bar","xtfn","abcdef"});
+	return 0;
+}

cpp/2205/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2205)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2205 220528-CN.cpp)
+ADD_EXECUTABLE(2205 220529.cpp)