QOJ.ac

QOJ

Límite de tiempo: 1 s Límite de memoria: 256 MB

#21387. 一個簡單嘅構造問題

Estadísticas

對於正整數 $n$,一個長度為 $n$ 嘅序列如果滿足以下條件,就叫做「紅磚序列」:

  • $1, 2, \ldots, n$ 入面嘅每個數喺個序列度都啱啱出現一次。
  • 每一對相鄰元素嘅和都唔係完全平方數。

畀定一個整數 $n$,請構造一個長度為 $n$ 嘅紅磚序列。

輸入格式

第一行包含一個整數 $T$($1 \le T \le 10^4$),代表測試數據嘅組數。

對於每組測試數據,唯一一行包含一個整數 $n$($1 \le n \le 4 \times 10^6$),代表要求嘅紅磚序列長度。

保證所有測試數據入面 $n$ 嘅總和唔超過 $4 \times 10^6$。可以證明喺畀定嘅限制之下一定有解。

輸出格式

輸出 $T$ 行,每行包含要構造嘅序列。如果有多個答案,輸出邊一個都得。

範例

輸入格式 1

5
1
2
3
4
5

輸出格式 1

1
1 2
1 2 3
1 2 3 4
1 4 2 3 5

說明

對於 $n = 5$,如果輸出嘅序列係 1 2 3 4 5,咁就係錯嘅答案,因為 $4 + 5 = 9$ 係完全平方數。

Discussions

About Discussions

The discussion section is only for posting: General Discussions (problem-solving strategies, alternative approaches), and Off-topic conversations.

This is NOT for reporting issues! If you want to report bugs or errors, please use the Issues section below.

Open Discussions 0
No discussions in this category.

Issues

About Issues

If you find any issues with the problem (statement, scoring, time/memory limits, test cases, etc.), you may submit an issue here. A problem moderator will review your issue.

Guidelines:

  1. This is not a place to publish discussions, editorials, or requests to debug your code. Issues are only visible to you and problem moderators.
  2. Do not submit duplicated issues.
  3. Issues must be filed in English or Chinese only.
Active Issues 0
No issues in this category.
Closed/Resolved Issues 0
No issues in this category.