제출 #604702

#제출 시각아이디문제언어결과실행 시간메모리
604702SeDunion캥거루 (CEOI16_kangaroo)C++17
0 / 100
1 ms340 KiB
#include<iostream> using namespace std; const int mod = 1e9 + 7; int mult(int x, int y) { return x * 1ll * y % mod; } void add(int &x, int y) { x += y; if (x >= mod) x -= mod; } int ad(int x, int y) { add(x, y); return x; } int dp[22][22][22][2]; int main() { ios_base::sync_with_stdio(0); cin.tie(0); int N, cs, cf; cin >> N >> cs >> cf; dp[1][1][1][0] = dp[1][1][1][1] = 1; for (int n = 1 ; n < N ; ++ n) { for (int x = 1 ; x <= n ; ++ x) { for (int y = 1 ; y <= n ; ++ y) { for (int z = 1 ; z <= y ; ++ z) { add(dp[n+1][x+1][z][0], dp[n][x][y][1]); } for (int z = y + 1 ; z <= n + 1 ; ++ z) { add(dp[n+1][x][z][1], dp[n][x][y][0]); } } } } cout << ad(dp[N][cs][cf][0], dp[N][cs][cf][1]); }
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