제출 #946619

#제출 시각아이디문제언어결과실행 시간메모리
946619vjudge1캥거루 (CEOI16_kangaroo)C++17
0 / 100
0 ms348 KiB
#include <bits/stdc++.h> using namespace std; using LL = long long; using PII = pair<int, int>; const int N = 4000; const int M = 1e9 + 7; int dp[N][N]; int main() { ios::sync_with_stdio(0); cin.tie(0); int n, cs, cf; cin >> n >> cs >> cf; dp[1][1] = 1; for(int i = 2; i <= n; ++i){ for(int j = 1; j <= i; ++j){ if(i == cs or i == cf) dp[i][j] = dp[i - 1][j] + dp[i - 1][j - 1]; else { dp[i][j] += dp[i - 1][j + 1] * j; //merging of two component dp[i][j] += dp[i - 1][j - 1] * j; // start of a new component } dp[i][j] %= M; } } cout << dp[n][1]<<"\n"; }
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