Codeforces Global Round 28
C
Kevin and Binary Strings
Codeforces
1200
原题
← BD →
翻译中…

Kevin discovered a binary string $s$ that starts with 1 in the river at Moonlit River Park and handed it over to you. Your task is to select two non-empty substrings$^{\text{∗}}$ of $s$ (which can be overlapped) to maximize the XOR value of these two substrings.

翻译中…

The XOR of two binary strings $a$ and $b$ is defined as the result of the $\oplus$ operation applied to the two numbers obtained by interpreting $a$ and $b$ as binary numbers, with the leftmost bit representing the highest value. Here, $\oplus$ denotes the bitwise XOR operation.

翻译中…

The strings you choose may have leading zeros.

翻译中…

$^{\text{∗}}$A string $a$ is a substring of a string $b$ if $a$ can be obtained from $b$ by the deletion of several (possibly, zero or all) characters from the beginning and several (possibly, zero or all) characters from the end.

翻译中…

Input

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Each test contains multiple test cases. The first line contains the number of test cases $t$ ($1 \le t \le 10^3$).

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The only line of each test case contains a binary string $s$ that starts with 1 ($1\le\lvert s\rvert\le 5000$).

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It is guaranteed that the sum of $\lvert s\rvert$ over all test cases doesn't exceed $5000$.

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Output

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For each test case, output four integers $l_1, r_1, l_2, r_2$ ($1 \le l_1 \le r_1 \le |s|$, $1 \le l_2 \le r_2 \le |s|$) — in the case the two substrings you selected are $s_{l_1} s_{l_1 + 1} \ldots s_{r_1}$ and $s_{l_2} s_{l_2 + 1} \ldots s_{r_2}$.

翻译中…

If there are multiple solutions, print any of them.

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Note

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In the first test case, we can choose $ s_2=\texttt{1} $ and $ s_1 s_2 s_3=\texttt{111} $, and $ \texttt{1}\oplus\texttt{111}=\texttt{110} $. It can be proven that it is impossible to obtain a larger result. Additionally, $ l_1=3$, $r_1=3$, $l_2=1$, $r_2=3 $ is also a valid solution.

翻译中…

In the second test case, $ s_1 s_2 s_3=\texttt{100} $, $ s_1 s_2 s_3 s_4=\texttt{1000} $, the result is $ \texttt{100}\oplus\texttt{1000}=\texttt{1100} $, which is the maximum.

翻译中…

样例

Input #1
5
111
1000
10111
11101
1100010001101
Output #1
2 2 1 3
1 3 1 4
1 5 1 4
3 4 1 5
1 13 1 11
InputCopy OutputCopy
题目信息
题号
2048C
时间限制
2 s
内存限制
256 MB
标签
位运算
暴力
贪心
模拟
字符串

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