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OI-codes/Codeforces/9/D/D.cpp

34 lines
554 B
C++

#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 40;
int n, h;
long long f[N][N];
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> h;
for (int i = 0; i <= n; i++) {
f[0][i] = 1;
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n; j++) {
for (int k = 0; k < i; k++) {
f[i][j] += f[k][j - 1] * f[i - k - 1][j - 1];
}
}
}
cout << f[n][n] - f[n][h - 1] << endl;
return 0;
}