add: 220205-CN

2202/220205-CN.cpp

@@ -0,0 +1,57 @@
+#include <vector>
+#include <iostream>
+
+/**
+ * 1219. Path with Maximum Gold
+ * In a gold mine grid of size m x n, each cell in this mine has an integer representing the amount of gold in that cell, 0 if it is empty.
+ *
+ * Return the maximum amount of gold you can collect under the conditions:
+ * - Every time you are located in a cell you will collect all the gold in that cell.
+ * - From your position, you can walk one step to the left, right, up, or down.
+ * - You can't visit the same cell more than once.
+ * - Never visit a cell with 0 gold.
+ * - You can start and stop collecting gold from any position in the grid that has some gold.
+ */
+
+class Solution {
+private:
+	static int dfs(const std::vector<std::vector<int>>& grid, int x, int y, bool* const vis) {
+		int ret = 0;
+		const auto m = grid.size(), n = grid.front().size();
+		vis[x * n + y] = true;
+		if (x > 0 && !vis[(x - 1) * n + y] && grid[x - 1][y]) {
+			ret = dfs(grid, x - 1, y, vis);
+		}
+		if (y > 0 && !vis[x * n + y - 1] && grid[x][y - 1]) {
+			ret = std::max(ret, dfs(grid, x, y - 1, vis));
+		}
+		if (x + 1 < m && !vis[(x + 1) * n + y] && grid[x + 1][y]) {
+			ret = std::max(ret, dfs(grid, x + 1, y, vis));
+		}
+		if (y + 1 < n && !vis[x * n + y + 1] && grid[x][y + 1]) {
+			ret = std::max(ret, dfs(grid, x, y + 1, vis));
+		}
+		vis[x * n + y] = false;
+		return ret + grid[x][y];
+	}
+public:
+	static int getMaximumGold(const std::vector<std::vector<int>>& grid) {
+		auto m = grid.size(), n = grid.front().size();
+		bool* const vis = new bool[m * n]{};
+		int ret = 0;
+		for (decltype(m) i = 0; i < m; ++i) {
+			for (decltype(n) j = 0; j < n; ++j) {
+				if (grid[i][j]) {
+					ret = std::max(ret, dfs(grid, i, j, vis));
+				}
+			}
+		}
+		delete[] vis;
+		return ret;
+	}
+};
+
+int main() {
+	std::cout << Solution::getMaximumGold({{0,0,1},{1,1,0},{1,1,0}});
+	return 0;
+}

2202/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2202)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2202 220204-CN.cpp)
+ADD_EXECUTABLE(2202 220205-CN.cpp)