LeetCode 1016: Binary String With Substrings Representing 1 To N Solution

Master LeetCode problem 1016 (Binary String With Substrings Representing 1 To N), a medium 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.

1016. Binary String With Substrings Representing 1 To N

Medium

String

Problem Explanation

Explanation

To solve this problem, we need to check if the binary representation of all integers from 1 to n are substrings of the given binary string s. We can achieve this by iterating through all integers from 1 to n, converting each integer to its binary representation, and checking if that binary representation is a substring of s. We can use a HashSet to store all unique substrings of s for efficient lookup.

Algorithm:
1. Initialize a HashSet to store all unique substrings of s.
2. Iterate through all integers from 1 to n.
3. Convert each integer to its binary representation.
4. Check if the binary representation is a substring of s.
5. If any binary representation is not found in the HashSet, return false.
6. If all binary representations are found, return true.
Time Complexity: O(n * log(n)) where n is the value of n.
Space Complexity: O(n * log(n)) for storing all unique binary representations of integers from 1 to n.

Solution Code

class Solution {
    public boolean queryString(String s, int n) {
        Set<String> substrings = new HashSet<>();
        for (int i = 1; i <= n; i++) {
            String binary = Integer.toBinaryString(i);
            if (!s.contains(binary)) {
                return false;
            }
        }
        return true;
    }
}

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