結果
問題 | No.1300 Sum of Inversions |
ユーザー | marroncastle |
提出日時 | 2020-11-27 22:56:50 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 890 ms / 2,000 ms |
コード長 | 1,324 bytes |
コンパイル時間 | 412 ms |
コンパイル使用メモリ | 81,940 KB |
実行使用メモリ | 191,028 KB |
最終ジャッジ日時 | 2024-07-26 19:14:25 |
合計ジャッジ時間 | 23,175 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 34 |
ソースコード
# Binary Indexed Tree (Fenwick Tree) class BIT: def __init__(self, n): self.n = n self.bit = [0]*(n+1) self.el = [0]*(n+1) def sum(self, i): s = 0 while i > 0: s += self.bit[i] i -= i & -i return s def add(self, i, x): # assert i > 0 self.el[i] += x while i <= self.n: self.bit[i] += x i += i & -i def get(self, i, j=None): if j is None: return self.el[i] return self.sum(j) - self.sum(i-1) def lower_bound(self,x): w = i = 0 k = 1<<((self.n).bit_length()) while k: if i+k <= self.n and w + self.bit[i+k] < x: w += self.bit[i+k] i += k k >>= 1 return i+1 N = int(input()) total1 = BIT(N+1) total2 = BIT(N+1) total3 = BIT(N+1) cnt1 = BIT(N+1) cnt2 = BIT(N+1) cnt3 = BIT(N+1) A = list(map(int, input().split())) comp = lambda arr: {e: i+1 for i, e in enumerate(sorted(set(arr)))} compA = comp(A) MOD = 998244353 A = A[::-1] for i in range(N): total1.add(compA[A[i]], A[i]) cnt1.add(compA[A[i]], 1) p = total1.sum(compA[A[i]]-1) q = cnt1.sum(compA[A[i]]-1) total2.add(compA[A[i]], (p+q*A[i])%MOD) cnt2.add(compA[A[i]], q%MOD) p = total2.sum(compA[A[i]]-1) q = cnt2.sum(compA[A[i]]-1) total3.add(compA[A[i]], (p+q*A[i])%MOD) cnt3.add(compA[A[i]], q%MOD) print(total3.sum(N+1)%MOD)