#991104 (PyPy3) No.1975 Zigzag Sequence

• 問題: No.1975 Zigzag Sequence
• ユーザー: 已经死了
• 提出日時: 2024-06-28 16:27:19
• 言語: PyPy3 (7.3.15)
• 結果: AC
• 実行時間: 488 ms / 2,000 ms
• コード長: 3,119 bytes
• コンパイル時間: 242 ms
• コンパイル使用メモリ: 82,176 KB
• 実行使用メモリ: 142,336 KB
• 最終ジャッジ日時: 2024-06-28 16:27:34
• 合計ジャッジ時間: 15,517 ms
• ジャッジサーバーID （参考情報）: judge2 / judge1

ファイルパターン	結果
sample	AC * 3
other	AC * 33

ソースコード

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import os,sys,random,threading
#sys.exit() 退出程序
from random import randint,choice,shuffle
#randint(a,b)从[a,b]范围随机选择一个数
#choice(seq)seq可以是一个列表,元组或字符串,从seq中随机选取一个元素
#shuffle(x)将一个可变的序列x中的元素打乱
from copy import deepcopy
from io import BytesIO,IOBase
from types import GeneratorType
from functools import lru_cache,reduce
#reduce(op,迭代对象)
from bisect import bisect_left,bisect_right
#bisect_left(x) 大于等于x的第一个下标
#bisect_right(x) 大于x的第一个下标
from collections import Counter,defaultdict,deque
from itertools import accumulate,combinations,permutations
#accumulate(a)用a序列生成一个累积迭代器，一般list化前面放个[0]做前缀和用
#combinations(a,k)a序列选k个 组合迭代器
#permutations(a,k)a序列选k个 排列迭代器
from heapq import  heapify,heappop,heappush
#heapify将列表转为堆
from typing import Generic,Iterable,Iterator,TypeVar,Union,List
from string import ascii_lowercase,ascii_uppercase,digits
#小写字母，大写字母，十进制数字
from math import ceil,floor,sqrt,pi,factorial,gcd,log,log10,log2,inf
#ceil向上取整，floor向下取整 ，sqrt开方 ，factorial阶乘
from decimal import Decimal,getcontext
#Decimal(s) 实例化Decimal对象,一般使用字符串
#getcontext().prec=100 修改精度
from sys import stdin, stdout, setrecursionlimit
input = lambda: sys.stdin.readline().rstrip("\r\n")
MI = lambda :map(int,input().split())
li = lambda :list(MI())
ii = lambda :int(input())
mod = int(1e9 + 7) #998244353
inf = int(1e20)
py = lambda :print("YES")
pn = lambda :print("NO")
DIRS = [(0, 1), (1, 0), (0, -1), (-1, 0)]  # 右下左上
DIRS8 = [(0, 1), (1, 1), (1, 0), (1, -1), (0, -1), (-1, -1), (-1, 0),(-1, 1)]  # →↘↓↙←↖↑↗
class BIT:
    """单点修改,区间和查询"""
    __slots__ = "size", "bit", "tree"
    def __init__(self, n: int):
        self.size = n
        self.bit = n.bit_length()
        self.tree = [0]*(n+1)
    def add(self, index: int, delta: int) -> None:
        # index 必须大于0
        while index <= self.size:
            self.tree[index]+=delta
            self.tree[index]%=mod
            index += index & -index
    def _query(self, index: int) -> int: 
        res = 0
        while index > 0:
            res += self.tree[index]
            res%=mod
            index -= index & -index
        return res
    def query(self, left: int, right: int) -> int:
        return (self._query(right) - self._query(left - 1))%mod
        
n=ii()
a=li()
d=sorted(set(a))
d={x:i+1 for i,x in enumerate(d)}
ls=[0]*n
lb=[0]*n
p=1
bit=BIT(len(d)+5)
for i in range(n):
    ls[i]=bit._query(d[a[i]]-1)
    lb[i]=bit.query(d[a[i]]+1,len(d)+3)
    bit.add(d[a[i]],p)
    p*=2
    p%=mod
rs=[0]*n
rb=[0]*n
p=1
bit=BIT(len(d)+5)
for i in range(n-1,-1,-1):
    rs[i]=bit._query(d[a[i]]-1)
    rb[i]=bit.query(d[a[i]]+1,len(d)+3)
    bit.add(d[a[i]],p)
    p*=2
    p%=mod
res=0
for i in range(1,n-1):
    res+=ls[i]*rs[i]+lb[i]*rb[i]
    res%=mod
print(res)
 
 
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