Leet Code 838. Push Dominoes

https://leetcode.com/problems/push-dominoes/

Example 1:

Input: dominoes = "RR.L"
Output: "RR.L"
Explanation: The first domino expends no additional force on the second domino.

package pep.Day62;

import java.util.LinkedList;
import java.util.Queue;

public class LeetCode_838_Push_dominoes {
    public static void main(String[] args) {
        System.out.print(pushDominoes(".L.R...LR..L.."));
    }

    public static String pushDominoes(String dominoes) {
        Queue<Pair> que = new LinkedList<>();
        char[] str = dominoes.toCharArray();

        // yha pr humne pairs bnakr queue me add kr diya
        for (int i = 0; i < str.length; i++) {
            char c = str[i];
            if (c != '.')
                que.add(new Pair(c, i));
        }

        while (!que.isEmpty()) {
            Pair remove = que.remove();
            if (remove.status == 'L') {
                // condition: index min. 1 hona cheye, tabhi 0th index ka check ho paega
                if (remove.index > 0 && str[remove.index - 1] == '.') {
                    str[remove.index - 1] = 'L';
                    que.add(new Pair('L', remove.index - 1));
                }
            } else {
                // condition: agr jo remove kiya hai uska index +1 chota hona chye mere array se
                // aur uski right me next position pr dot hona cheye
                // toh yeh mera potential right bnn skta hai
                if (remove.index + 1 < str.length && str[remove.index + 1] == '.') {
                    // agr right ki next of next me Left wala exist krta hai
                    // to left wale ko bhi remove kr denge
                    if (remove.index + 2 < str.length && str[remove.index + 2] == 'L') {
                        que.remove();
                    } else {
                        str[remove.index+1] = 'R';
                        que.add(new Pair('R', remove.index + 1));
                    }
                }

            }
        }

        return new String(str);

    }

    static class Pair {
        char status;
        int index;

        Pair(char status, int index) {
            this.status = status;
            this.index = index;
        }
    }
}