結果
| 問題 |
No.1885 Flat Permutation
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2022-03-25 22:54:31 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 1,864 bytes |
| コンパイル時間 | 166 ms |
| コンパイル使用メモリ | 82,152 KB |
| 実行使用メモリ | 85,788 KB |
| 最終ジャッジ日時 | 2024-10-14 06:56:45 |
| 合計ジャッジ時間 | 5,067 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 15 TLE * 1 -- * 27 |
ソースコード
# import sys
# input = sys.stdin.readline
# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')
def mp():return map(int,input().split())
def lmp():return list(map(int,input().split()))
def mps(A):return [tuple(map(int, input().split())) for _ in range(A)]
def stoi(LIST):return list(map(int,LIST))
def itos(LIST):return list(map(str,LIST))
def bitA(X,A):return X & 1<<A == 1<<A
import math
import bisect
import heapq
import time
from copy import copy as cc
from copy import deepcopy as dc
from itertools import accumulate, product
from collections import Counter, defaultdict, deque
def ceil(U,V):return (U+V-1)//V
def modf1(N,MOD):return (N-1)%MOD+1
inf = int(1e18+20)
mod = 998244353
n,x,y = mp()
if x > y:x,y = y,x
if x != 1 and y != n:
if y-x == 1:
print(0)
else:
step = y - 1 - (x+1) - 3
jump = 1
ans = 1
now = 1
while step >= 0:
bunsi = (step+1) * (step+2)* (step+3)% mod
bunbo = jump * (step+jump+1)*(step+jump+2)% mod
now *= bunsi*pow(bunbo,mod-2,mod)
ans += now
ans %= mod
step -= 3
jump += 1
print(ans % mod)
elif x == 1:
step = y-1-3
jump = 1
ans = 1
now = 1
while step >= 0:
bunsi = (step + 1) * (step + 2) * (step + 3)% mod
bunbo = jump * (step + jump + 1) * (step + jump + 2)% mod
now *= bunsi * pow(bunbo, mod - 2, mod)
ans += now
ans %= mod
step -= 3
jump += 1
print(ans % mod)
else:
step = n-x-3
jump = 1
ans = 1
now = 1
while step >= 0:
bunsi = (step + 1) * (step + 2) * (step + 3) % mod
bunbo = jump * (step + jump + 1) * (step + jump + 2) % mod
ans += bunsi * pow(bunbo, mod - 2, mod)
ans %= mod
step -= 3
jump += 1
print(ans%mod)