Problem H. Hills And Valleys
时间限制 1000 ms
内存限制 256 MB
Tauren has an integer sequence $A$ of length $n$ (1-based). He wants you to invert an interval $[l, r]$ $(1 \leq l \leq r \leq n)$ of $A$ (i.e. replace $A_l, A_{l + 1}, \cdots, A_r$ with $A_r, A_{r - 1}, \cdots, A_l$) to maximize the length of the longest non-decreasing subsequence of $A$. Find that maximal length and any inverting way to accomplish that mission.
A non-decreasing subsequence of $A$ with length $m$ could be represented as $A_{x_1}, A_{x_2}, \cdots, A_{x_m}$ with $1 \leq x_1 < x_2 < \cdots < x_m \leq n$ and $A_{x_1} \leq A_{x_2} \leq \cdots \leq A_{x_m}$.
输入数据
输出数据
For each test case, print three space-separated integers $m, l$ and $r$ in one line, where $m$ indicates the maximal length and $[l, r]$ indicates the relevant interval to invert.
样例输入
复制
2
9
864852302
9
203258468
样例输出
样例说明
In the first example, 864852302 after inverting [1, 8] is 032584682, one of the longest non-decreasing subsequences of which is 03588. In the second example, 203258468 after inverting [1, 2] is 023258468, one of the longest non-decreasing subsequences of which is 023588.
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