結果
| 問題 |
No.694 square1001 and Permutation 3
|
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-04-16 00:02:18 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 2,042 ms / 3,000 ms |
| コード長 | 2,252 bytes |
| コンパイル時間 | 501 ms |
| コンパイル使用メモリ | 82,008 KB |
| 実行使用メモリ | 201,712 KB |
| 最終ジャッジ日時 | 2025-04-16 00:04:18 |
| 合計ジャッジ時間 | 12,424 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 * 1 |
| other | AC * 13 |
ソースコード
import bisect
class FenwickTree:
def __init__(self, size):
self.n = size
self.tree = [0] * (self.n + 2) # 1-based indexing
def update(self, idx, delta=1):
while idx <= self.n:
self.tree[idx] += delta
idx += idx & -idx
def query(self, idx):
res = 0
while idx > 0:
res += self.tree[idx]
idx -= idx & -idx
return res
def main():
import sys
input = sys.stdin.read().split()
ptr = 0
n = int(input[ptr])
ptr += 1
A = list(map(int, input[ptr:ptr + n]))
ptr += n
# Coordinate compression
sorted_A = sorted(A)
unique = []
prev = None
for x in sorted_A:
if x != prev:
unique.append(x)
prev = x
m = len(unique)
def get_rank(x):
return bisect.bisect_left(unique, x) + 1 # 1-based
# Compute initial inversion count
fenwick = FenwickTree(m)
initial = 0
for i in reversed(range(n)):
x = A[i]
r = get_rank(x)
initial += fenwick.query(r - 1)
fenwick.update(r)
# Compute left_less and left_greater
fenwick = FenwickTree(m)
left_less = [0] * n
left_greater = [0] * n
for i in range(n):
x = A[i]
r = get_rank(x)
left_less[i] = fenwick.query(r - 1)
left_greater[i] = fenwick.query(m) - fenwick.query(r)
fenwick.update(r)
# Compute right_less and right_greater
fenwick = FenwickTree(m)
right_less = [0] * n
right_greater = [0] * n
for i in reversed(range(n)):
x = A[i]
r = get_rank(x)
right_less[i] = fenwick.query(r - 1)
right_greater[i] = fenwick.query(m) - fenwick.query(r)
fenwick.update(r)
# Compute delta for each index
delta = [0] * n
for i in range(n):
d = (right_greater[i] + left_greater[i]) - (right_less[i] + left_less[i])
delta[i] = d
# Compute the answer array
ans = [0] * n
current = initial
for k in range(n):
ans[k] = current
if k < n - 1:
current += delta[k]
# Print each line of ans
print('\n'.join(map(str, ans)))
if __name__ == "__main__":
main()
lam6er