#P1204D1. Kirk and a Binary String (easy version)
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ID: 4898
Type: RemoteJudge
1000ms
256MiB
Tried: 0
Accepted: 0
Difficulty: (None)
Uploaded By:
Hydro
Tags> Kirk and a Binary String (easy version)
No submission language available for this problem.
Description
The only difference between easy and hard versions is the length of the string. You can hack this problem only if you solve both problems.
Kirk has a binary string $s$ (a string which consists of zeroes and ones) of length $n$ and he is asking you to find a binary string $t$ of the same length which satisfies the following conditions:
- For any $l$ and $r$ ($1 \leq l \leq r \leq n$) the length of the longest non-decreasing subsequence of the substring $s_{l}s_{l+1} \ldots s_{r}$ is equal to the length of the longest non-decreasing subsequence of the substring $t_{l}t_{l+1} \ldots t_{r}$;
- The number of zeroes in $t$ is the maximum possible.
A non-decreasing subsequence of a string $p$ is a sequence of indices $i_1, i_2, \ldots, i_k$ such that $i_1 < i_2 < \ldots < i_k$ and $p_{i_1} \leq p_{i_2} \leq \ldots \leq p_{i_k}$. The length of the subsequence is $k$.
If there are multiple substrings which satisfy the conditions, output any.
The first line contains a binary string of length not more than $2\: 000$.
Output a binary string which satisfied the above conditions. If there are many such strings, output any of them.
Input
The first line contains a binary string of length not more than $2\: 000$.
Output
Output a binary string which satisfied the above conditions. If there are many such strings, output any of them.
Samples
110
010
010
010
0001111
0000000
0111001100111011101000
0011001100001011101000
Note
In the first example:
- For the substrings of the length $1$ the length of the longest non-decreasing subsequnce is $1$;
- For $l = 1, r = 2$ the longest non-decreasing subsequnce of the substring $s_{1}s_{2}$ is $11$ and the longest non-decreasing subsequnce of the substring $t_{1}t_{2}$ is $01$;
- For $l = 1, r = 3$ the longest non-decreasing subsequnce of the substring $s_{1}s_{3}$ is $11$ and the longest non-decreasing subsequnce of the substring $t_{1}t_{3}$ is $00$;
- For $l = 2, r = 3$ the longest non-decreasing subsequnce of the substring $s_{2}s_{3}$ is $1$ and the longest non-decreasing subsequnce of the substring $t_{2}t_{3}$ is $1$;
The second example is similar to the first one.