'commit'

TangDou/AcWing/Math/ZhuHeJiShu/P1754.cpp

@@ -0,0 +1,16 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+typedef long long LL;
+const int N = 30;
+LL f[N];
+int main() {
+    int n;
+    cin >> n;
+    f[0] = 1;
+    for (int i = 1; i <= n; i++)
+        for (int j = 1; j <= i; j++)
+            f[i] += f[j - 1] * f[i - j];
+    cout << f[n] << endl;
+    return 0;
+}