本人计概上半个学期的作业做完了

cs101/2023mid/exam_2023mid_05_mask.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+#include <vector>
+
+using GridRow = std::vector<int>;
+using Grid = std::pmr::vector<GridRow>;
+
+int n;
+std::vector<std::vector<bool>> infected, wearing_mask;
+std::vector<std::vector<int>> infection_flag;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    std::cin >> n;
+
+    return 0;
+}