LeetCode 761: Special Binary String Solution
Master LeetCode problem 761 (Special Binary String), a hard challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
Problem Explanation
Explanation
To solve this problem, we need to understand the properties of special binary strings. We can break down the problem into smaller subproblems by recursively dealing with the special substrings within the given special binary string. The key insight is that a special binary string can be broken down into the largest possible special substrings, and these special substrings can be rearranged to form the lexicographically largest resulting string.
- Sort the special substrings in descending order, where each special substring is also a special binary string.
- Recursively solve each special substring and concatenate the results to form the final lexicographically largest string.
Solution Code
class Solution {
public String makeLargestSpecial(String s) {
int count = 0, i = 0;
List<String> specialStrings = new ArrayList<>();
for (int j = 0; j < s.length(); j++) {
count += s.charAt(j) == '1' ? 1 : -1;
if (count == 0) {
specialStrings.add("1" + makeLargestSpecial(s.substring(i + 1, j)) + "0");
i = j + 1;
}
}
Collections.sort(specialStrings, Collections.reverseOrder());
return String.join("", specialStrings);
}
}Try It Yourself
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