Blogs Hub

by Sumit Chourasia | Dec 07, 2020 | Category :coding | Tags : algorithm data-structure easy leetcode string

Goal Parser Interpretation - String - Easy - LeetCode

Goal Parser Interpretation - String - Easy - LeetCode

You own a Goal Parser that can interpret a string command. The command consists of an alphabet of "G", "()" and/or "(al)" in some order. The Goal Parser will interpret "G" as the string "G", "()" as the string "o", and "(al)" as the string "al". The interpreted strings are then concatenated in the original order.

Given the string command, return the Goal Parser's interpretation of command.

 

Example 1:

Input: command = "G()(al)"
Output: "Goal"
Explanation: The Goal Parser interprets the command as follows:
G -> G
() -> o
(al) -> al
The final concatenated result is "Goal".
Example 2:

Input: command = "G()()()()(al)"
Output: "Gooooal"
Example 3:

Input: command = "(al)G(al)()()G"
Output: "alGalooG"
 

Constraints:

1 <= command.length <= 100
command consists of "G", "()", and/or "(al)" in some order.

public class Solution {
    public string Interpret(string command) {
        var sb = new StringBuilder();
        for(int i=0;i<command.Length;){
            if(command[i]=='G'){
                sb.Append("G");
                i++;
            }
            else if(command[i]=='(' && command[i+1]==')'){
                sb.Append("o");
                i+=2;
            }
            else if(command[i]=='(' && command[i+1]=='a' && command[i+2]=='l' && command[i+3]==')'){
                sb.Append("al");
                i+=4;
            }
        }
        
        return sb.ToString();
    }
}

t

Time Complexity: O(n)

Space Complexity: O(n)