From b8916e9ab73141ba62fae07578242acafe57f5d7 Mon Sep 17 00:00:00 2001
From: Eatswap <root@eatswap.org>
Date: Sun, 19 Feb 2023 01:59:49 +0800
Subject: [PATCH] add: 230219-CN

---
 cpp/2302/230219-CN.cpp  | 40 ++++++++++++++++++++++++++++++++++++++++
 cpp/2302/CMakeLists.txt |  2 +-
 cpp/CMakeLists.txt      |  2 +-
 3 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 cpp/2302/230219-CN.cpp

diff --git a/cpp/2302/230219-CN.cpp b/cpp/2302/230219-CN.cpp
new file mode 100644
index 0000000..476f4b1
--- /dev/null
+++ b/cpp/2302/230219-CN.cpp
@@ -0,0 +1,40 @@
+#include <queue>
+#include <utility>
+#include <numeric>
+#include <execution>
+
+class Solution {
+public:
+	static double maxAverageRatio(std::vector<std::vector<int>>& c, int ex) {
+		int n = c.size();
+		double ans = std::transform_reduce(
+			std::execution::par,
+			c.begin(),
+			c.end(),
+			0.0,
+			std::plus{},
+			[](const std::vector<int>& x) {
+				return double(x[0]) / double(x[1]);
+			}
+		);
+		std::priority_queue<std::pair<double, int>> incr;
+		for (int i = 0; i < n; ++i)
+			incr.emplace(double(c[i][0] + 1) / double(c[i][1] + 1) - double(c[i][0]) / double(c[i][1]), i);
+		while (ex--) {
+			const auto [delta, i] = incr.top();
+			incr.pop();
+			ans += delta;
+			++c[i][0], ++c[i][1];
+			incr.emplace(double(c[i][0] + 1) / double(c[i][1] + 1) - double(c[i][0]) / double(c[i][1]), i);
+		}
+		return ans / n;
+	}
+};
+
+int main() {
+	std::vector<std::vector<int>> c {
+		{2,4},{3,9},{4,5},{2,10}
+	};
+	std::printf("%.6f\n", Solution::maxAverageRatio(c, 4));
+	return 0;
+}
diff --git a/cpp/2302/CMakeLists.txt b/cpp/2302/CMakeLists.txt
index fcef160..e9f1b86 100644
--- a/cpp/2302/CMakeLists.txt
+++ b/cpp/2302/CMakeLists.txt
@@ -3,4 +3,4 @@ PROJECT(2302)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2302 230218-CN.cpp)
+ADD_EXECUTABLE(2302 230219-CN.cpp)
diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index 3415eac..9dbc513 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -16,7 +16,7 @@ ENDIF()
 # Optimisation
 # SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Ofast -march=native -mtune=native -finline-functions -ffast-math -fomit-frame-pointer")
 
-ADD_EXECUTABLE(leetcode-cpp main.cpp 2302/230218.cpp 2302/230218-CN.cpp)
+ADD_EXECUTABLE(leetcode-cpp main.cpp 2302/230218.cpp 2302/230218-CN.cpp 2302/230219-CN.cpp)
 
 # ADD_SUBDIRECTORY(2112)
 # ADD_SUBDIRECTORY(2201)