add: 220426-CN [cpp]

cpp/2204/220426-CN.cpp

@@ -0,0 +1,32 @@
+#include <vector>
+#include <algorithm>
+#include <numeric>
+
+/**
+ * 883. Projection Area of 3D Shapes
+ * You are given an n x n grid where we place some 1 x 1 x 1 cubes that are axis-aligned with the x, y, and z axes.
+ * Each value v = grid[i][j] represents a tower of v cubes placed on top of the cell (i, j).
+ * We view the projection of these cubes onto the xy, yz, and zx planes.
+ * A projection is like a shadow, that maps our 3-dimensional figure to a 2-dimensional plane. We are viewing the "shadow" when looking at the cubes from the top, the front, and the side.
+ * Return the total area of all three projections.
+ */
+
+class Solution {
+public:
+	static int projectionArea(const std::vector<std::vector<int>>& G) {
+		const int n = G.size();
+		int xy = 0, yz = 0, zx = 0;
+		std::for_each(G.begin(), G.end(), [&](const std::vector<int>& v) {
+			xy += std::count_if(v.begin(), v.end(), [](int x) { return x > 0; });
+			zx += *std::max_element(v.begin(), v.end());
+		});
+		for (int i = 0; i < n; ++i) {
+			int t = 0;
+			for (int j = 0; j < n; ++j) {
+				t = std::max(t, G[j][i]);
+			}
+			yz += t;
+		}
+		return xy + yz + zx;
+	}
+};

cpp/2204/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2204)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2204 220426.cpp)
+ADD_EXECUTABLE(2204 220426-CN.cpp)