#749033 (C++17) No.1885 Flat Permutation

• 問題: No.1885 Flat Permutation
• ユーザー: hassybirobiro
• 提出日時: 2022-03-26 08:35:40
• 言語: C++17 (gcc 12.3.0 + boost 1.83.0)
• 結果: WA
• 実行時間: -
• コード長: 2,899 bytes
• コンパイル時間: 5,419 ms
• コンパイル使用メモリ: 337,112 KB
• 実行使用メモリ: 5,248 KB
• 最終ジャッジ日時: 2024-10-15 00:17:24
• 合計ジャッジ時間: 6,743 ms
• ジャッジサーバーID （参考情報）: judge2 / judge3

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 5,248 KB
testcase_01	AC	2 ms; 5,248 KB
testcase_02	WA	-
testcase_03	WA	-
testcase_04	AC	2 ms; 5,248 KB
testcase_05	AC	2 ms; 5,248 KB
testcase_06	AC	2 ms; 5,248 KB
testcase_07	AC	2 ms; 5,248 KB
testcase_08	AC	2 ms; 5,248 KB
testcase_09	AC	2 ms; 5,248 KB
testcase_10	AC	2 ms; 5,248 KB
testcase_11	AC	2 ms; 5,248 KB
testcase_12	AC	2 ms; 5,248 KB
testcase_13	AC	2 ms; 5,248 KB
testcase_14	AC	2 ms; 5,248 KB
testcase_15	AC	2 ms; 5,248 KB
testcase_16	WA	-
testcase_17	WA	-
testcase_18	WA	-
testcase_19	AC	3 ms; 5,248 KB
testcase_20	AC	4 ms; 5,248 KB
testcase_21	WA	-
testcase_22	WA	-
testcase_23	AC	3 ms; 5,248 KB
testcase_24	AC	3 ms; 5,248 KB
testcase_25	WA	-
testcase_26	AC	3 ms; 5,248 KB
testcase_27	WA	-
testcase_28	WA	-
testcase_29	WA	-
testcase_30	WA	-
testcase_31	WA	-
testcase_32	AC	3 ms; 5,248 KB
testcase_33	AC	3 ms; 5,248 KB
testcase_34	WA	-
testcase_35	WA	-
testcase_36	WA	-
testcase_37	AC	3 ms; 5,248 KB
testcase_38	WA	-
testcase_39	WA	-
testcase_40	WA	-
testcase_41	WA	-
testcase_42	WA	-
testcase_43	WA	-
testcase_44	WA	-
testcase_45	WA	-
testcase_46	WA	-

ソースコード

#include <bits/stdc++.h>
#include <boost/multi_array.hpp>
#include <boost/optional.hpp>
#include <boost/range/irange.hpp>
#include <boost/range/algorithm.hpp>
#include <boost/range/adaptors.hpp>
#include <atcoder/all>

using namespace atcoder;

using namespace std;

namespace adaptor = boost::adaptors;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vl = vector<long>;
using vvl = vector<vl>;
using pii = pair<int, int>;
using pll = pair<long, long>;
using vpii = vector<pii>;
using vpll = vector<pll>;
using vstr = vector<string>;


constexpr ll INF_LL=1LL<<60;
constexpr int INF_I=1LL<<30;

#define rep(i,n) for(int i=0; i<((int)(n)); i++)
#define reps(i,n) for(int i=1; i<=((int)(n)); i++)
#define rrep(i,n) for(int i=((int)(n)); i>0; i--)
#define rreps(i,n) for(int i=((int)(n)-1); i>=0; i--)
#define vector_cin(x) for(auto &n : (x)) cin >> n
#define ALL(x) (x).begin(), (x).end()
#define YesNo(x) ((x) ? "Yes" : "No")
#define pb emplace_back

template <class BidirectionalIterator, class Compare>
bool next_combination(BidirectionalIterator first, BidirectionalIterator last,
					  Compare comp, size_t r)
{
	BidirectionalIterator subset = first + r;
	
	if (first == last || first == subset || last == subset) {
		return false;
	}
	
	BidirectionalIterator src = subset;
	
	while (first != src) {
		src--;
		
		if (comp(*src, *(last - 1))) {
			BidirectionalIterator dst = subset;
			
			while (*src >= *dst) {
				dst++;
			}
			
			std::iter_swap(src, dst);
			std::rotate(src + 1, dst + 1, last);
			std::rotate(subset, subset + (last - dst) - 1, last);
			
			return true;
		}
	}
	
	rotate(first, subset, last);
	
	return false;
}

template <class BidirectionalIterator>
bool next_combination(BidirectionalIterator first, BidirectionalIterator last,
					  size_t r)
{
	using value_type =
	typename std::iterator_traits<BidirectionalIterator>::value_type;
	
	return next_combination(first, last, std::less<value_type>(), r);
}

template <typename T>
bool chmax(T &a, const T& b) {
	if (a < b){
		a = b;
		return true;
	}
	return false;
}

template <typename T>
bool chmin(T &a, const T& b) {
	if (a > b){
		a = b;
		return true;
	}
	return false;
}

ll ceilint(ll x, ll y) { //  x/y の 切り上げ
	return (x + y - 1) / y;
}

void Main();

int main() {
	std::cin.tie(nullptr);
	std::ios_base::sync_with_stdio(false);
	std::cout << std::fixed << std::setprecision(15);
	Main();
	return 0;
}

//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

void Main() {
	int N, X, Y;
	cin >> N >> X >> Y;
	X--;Y--;
	if (X > Y)
		swap(X, Y);
	vector<modint998244353> dp(N, 0);
	dp[X] = 1;
	for (int i = 1; i < N; i++) {
		if (i == X)
			continue;
		if (i < 3)
			dp[i] = dp[i - 1];
		else
			dp[i] = dp[i - 1] + dp[i - 3];
	}
	cout << dp[Y].val() << endl;
}