結果
| 問題 |
No.1867 Partitions and Inversions
|
| コンテスト | |
| ユーザー |
qwewe
|
| 提出日時 | 2025-04-24 12:28:02 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 1,662 bytes |
| コンパイル時間 | 268 ms |
| コンパイル使用メモリ | 82,236 KB |
| 実行使用メモリ | 333,656 KB |
| 最終ジャッジ日時 | 2025-04-24 12:30:24 |
| 合計ジャッジ時間 | 7,044 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | -- * 3 |
| other | AC * 2 TLE * 1 -- * 62 |
ソースコード
import bisect
def main():
import sys
input = sys.stdin.read
data = input().split()
n = int(data[0])
P = list(map(int, data[1:n+1]))
P = [0] + P # 1-based indexing
# Precompute sorted lists for each j (1-based)
sorted_lists = []
current = []
for j in range(1, n+1):
current.append(P[j])
current.sort()
sorted_lists.append(current.copy())
# Precompute count[j][i] for j < i
count = [[0]*(n+2) for _ in range(n+2)]
for j in range(1, n+1):
sorted_j = sorted_lists[j-1]
for i in range(j+1, n+1):
v = P[i]
cnt = len(sorted_j) - bisect.bisect_right(sorted_j, v)
count[j][i] = cnt
# Precompute inv_count[j][i] = sum_{y=j+1 to i} count[j][y]
inv_count = [[0]*(n+2) for _ in range(n+2)]
for j in range(1, n+1):
prefix = [0]*(n+2)
for i in range(1, n+1):
prefix[i] = prefix[i-1] + count[j][i]
for i in range(1, n+1):
inv_count[j][i] = prefix[i] - prefix[j]
# Compute DP
INF = float('inf')
dp = [[INF]*(n+2) for _ in range(n+2)]
# Base case: k=1, all i
for i in range(1, n+1):
dp[1][i] = 0
for k in range(2, n+1):
for i in range(k, n+1):
min_val = INF
for j in range(k-1, i):
if dp[k-1][j] != INF:
current = dp[k-1][j] + inv_count[j][i]
if current < min_val:
min_val = current
dp[k][i] = min_val
# The answer for k is dp[k][n]
for k in range(1, n+1):
print(dp[k][n])
if __name__ == "__main__":
main()
qwewe