結果
| 問題 |
No.1864 Shortest Paths Counting
|
| コンテスト | |
| ユーザー |
shobonvip
|
| 提出日時 | 2022-03-04 23:02:24 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 575 ms / 2,000 ms |
| コード長 | 1,995 bytes |
| コンパイル時間 | 1,925 ms |
| コンパイル使用メモリ | 81,716 KB |
| 実行使用メモリ | 136,200 KB |
| 最終ジャッジ日時 | 2024-07-18 21:37:09 |
| 合計ジャッジ時間 | 7,394 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 23 |
ソースコード
# DIST a-b = 2X, a+b = 2Y として定める.
mod = 998244353
class BIT:
"""
<Attention> 0-indexed.
query ... return the sum [0 to m]
sum ... return the sum [a to b]
sumall ... return the sum [all]
add ... 'add' number to element (be careful that it doesn't set a value.)
search ... the sum version of bisect.right
output ... return the n-th element
listout ... return the BIT list
"""
def query(self, m):
res = 0
while m > 0:
res = (res+self.bit[m])%mod
m -= m&(-m)
return res
def sum(self, a, b):
return (self.query(b)-self.query(a))%mod
def sumall(self):
bitlen = self.bitlen-1
return self.query(bitlen)
def add(self, m, x):
m += 1
bitlen = len(self.bit)
while m <= bitlen-1:
self.bit[m] = (self.bit[m]+x)%mod
m += m&(-m)
return
def output(self, a):
return self.query(a+1)-self.query(a)
def listout(self):
return self.bit
def __init__(self, a):
self.bitlen = a+1
self.bit = [0]*(a+1)
n = int(input())
a = []
sx, sy = 0, 0
gx, gy = 0, 0
for i in range(n):
x, y = map(int, input().split())
if i == 0:
sx, sy = x + y, x - y
elif i == n-1:
gx, gy = x + y, x - y
else:
a.append((x + y, x - y))
#print(sx, sy, gx, gy)
if gx <= sx:
sx, sy, gx, gy = gx, gy, sx, sy
ymin = min(sy, gy)
ymax = max(sy, gy)
b = []
c = []
def compress(arr):
*XS, = set(arr)
XS.sort()
return {cmp_e:cmp_i for cmp_i, cmp_e in enumerate(XS)}
for i in range(n-2):
if sx <= a[i][0] <= gx and ymin <= a[i][1] <= ymax:
b.append((a[i][0], a[i][1]))
c.append(a[i][1])
mode = 0
if sy <= gy:
# increase
mode = 1
c_cmp = compress(c)
# print(c)
# print(c_cmp)
#print(b)
# if
b.sort()
size = len(b)
dp = [0 for i in range(size+1)]
dp[0] = 1
bit = BIT(size+1)
ans = 0
if mode:
bit.add(0, 1)
for i in range(size):
bit.add(c_cmp[b[i][1]]+1, bit.query(c_cmp[b[i][1]]+2))
print(bit.sumall())
else:
bit.add(size, 1)
for i in range(size):
bit.add(c_cmp[b[i][1]], bit.sum(c_cmp[b[i][1]], size+1))
print(bit.sumall())
shobonvip