Add FZOI Codes

FZOI/神犇 炸弹.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+#define int long long
+using namespace std;
+
+int m;
+int arr[1000005];
+
+int f(int x)
+{
+	if(arr[x] == 1) return 0;
+	if(x == 1) return 1;
+	if(x == 2) return 2;
+	if(x == 3) return 4;
+	return f(x - 1) + f(x - 2) + f(x - 3);
+}
+
+signed main()
+{
+	int n;
+	cin >> n >> m ;
+	for(int i = 1; i <= m; ++ i)
+	{
+		int a;
+		cin >> a ;
+		arr[a] = 1;
+	}
+	cout << f(n) ;
+	return 0;
+}