結果
問題 |
No.1885 Flat Permutation
|
ユーザー |
|
提出日時 | 2022-03-25 23:20:21 |
言語 | PyPy3 (7.3.15) |
結果 |
WA
|
実行時間 | - |
コード長 | 2,012 bytes |
コンパイル時間 | 242 ms |
コンパイル使用メモリ | 82,440 KB |
実行使用メモリ | 77,248 KB |
最終ジャッジ日時 | 2024-10-14 07:30:17 |
合計ジャッジ時間 | 5,415 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 25 WA * 18 |
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) bunbo = jump * (step+jump+1)*(step+jump+2) now *= bunsi*pow(bunbo,mod-2,mod) now %= mod ans += now ans %= mod step -= 3 jump += 1 print(ans % mod) elif x == 1: if y-x == 1: print(0) exit() step = y-1-3 jump = 1 ans = 1 now = 1 while step >= 0: bunsi = (step + 1) * (step + 2) * (step + 3) bunbo = jump * (step + jump + 1) * (step + jump + 2) now *= bunsi * pow(bunbo, mod - 2, mod) now %= mod ans += now ans %= mod step -= 3 jump += 1 print(ans % mod) else: if y-x == 1: print(0) exit() step = n-x-3 jump = 1 ans = 1 now = 1 while step >= 0: bunsi = (step + 1) * (step + 2) * (step + 3) bunbo = jump * (step + jump + 1) * (step + jump + 2) now *= bunsi * pow(bunbo, mod - 2, mod) now %= mod ans += now ans %= mod step -= 3 jump += 1 print(ans % mod)