LeetCode 1678: Goal Parser Interpretation Solution

Master LeetCode problem 1678 (Goal Parser Interpretation), a easy 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.

1678. Goal Parser Interpretation

Easy

String

Problem Explanation

Explanation:

To solve this problem, we can iterate through the input string command character by character and build the interpreted string based on the rules given in the problem description. We can use a StringBuilder to efficiently build the final interpreted string.

If we encounter the character 'G', we simply append 'G' to the interpreted string.
If we encounter the characters '()', we append 'o' to the interpreted string.
If we encounter the characters '(al)', we append 'al' to the interpreted string.

After iterating through the entire command string, we will have the final interpreted string, which we can return as the result.

Time Complexity: O(n), where n is the length of the command string. Space Complexity: O(n), to store the interpreted string.

Java:

Solution Code

class Solution {
    public String interpret(String command) {
        StringBuilder sb = new StringBuilder();
        
        for (int i = 0; i < command.length(); i++) {
            char c = command.charAt(i);
            if (c == 'G') {
                sb.append('G');
            } else if (c == '(' && command.charAt(i + 1) == ')') {
                sb.append('o');
                i++; // skip the next character ')'
            } else {
                sb.append("al");
                i += 3; // skip the characters 'al)'
            }
        }
        
        return sb.toString();
    }
}

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