✅ (wip) P7911 莫名其妙不一样 https://www.luogu.com.cn/problem/P7911

add-oil/main.cc

@@ -0,0 +1,18 @@
+#include <iostream>
+#include <cstring>
+#include <algorithm>
+using namespace std;
+int main() {
+    int num = 0;
+    string str;
+    cin >> str;
+    if (atoi(str[0]) > 2) {
+        num++;
+    }
+    bool is_feb = atoi(str[1]) == 2;
+    int days = stoi(str[3].to_string()+str[4].to_string());
+    if (days > 30 || (is_feb && days > 28)) {
+        num++;
+    }
+    cout << num << endl;
+}