LeetCode 1410: HTML Entity Parser Solution

Master LeetCode problem 1410 (HTML Entity Parser), 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.

1410. HTML Entity Parser

Medium

Hash Table String

Problem Explanation

Explanation

To solve this problem, we can iterate through the input text character by character. When we encounter an HTML entity, we replace it with the corresponding special character. We can use a hashmap to store the mappings of HTML entities to special characters. We iterate through the text and check if the current substring matches any HTML entity. If it does, we replace it with the corresponding special character.

Algorithm:

Initialize a hashmap to store the mappings of HTML entities to special characters.
Initialize an empty string to store the result.
Iterate through the input text character by character.
Check if the current substring matches any HTML entity.
If it does, replace it with the corresponding special character.
Append the character to the result string.
Return the result string.

Time Complexity:

The time complexity of this approach is O(n), where n is the length of the input text.

Space Complexity:

The space complexity is O(1) because we are using a constant amount of extra space regardless of the input size.

Solution Code

class Solution {
    public String entityParser(String text) {
        HashMap<String, String> entities = new HashMap<>();
        entities.put("&quot;", "\"");
        entities.put("&apos;", "'");
        entities.put("&amp;", "&");
        entities.put("&gt;", ">");
        entities.put("&lt;", "<");
        entities.put("&frasl;", "/");
        
        StringBuilder result = new StringBuilder();
        int n = text.length();
        int i = 0;
        
        while (i < n) {
            boolean foundEntity = false;
            for (String entity : entities.keySet()) {
                if (text.startsWith(entity, i)) {
                    result.append(entities.get(entity));
                    i += entity.length();
                    foundEntity = true;
                    break;
                }
            }
            if (!foundEntity) {
                result.append(text.charAt(i));
                i++;
            }
        }
        
        return result.toString();
    }
}

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