LC2337.java

/*
 * LC2237
 */

import java.util.*;

public class LC2337 {
    public static boolean canChange(String start, String target) {
        int i = 0;
        int j = 0;
        int n = start.length();
        while (i < n || j < n) {
            // skip all blanks in start
            while (i < n && start.charAt(i) == '_') {
                i++;
            }

            // skip all blanks in target
            while (j < n && target.charAt(j) == '_') {
                j++;
            }

            // count is same only if both the string end at the same time
            if (i == n || j == n) {
                return i == n && j == n;
            }

            // check false scenario
            if (start.charAt(i) != target.charAt(j) || (start.charAt(i) == 'L' && j > i)
                    || (start.charAt(i) == 'R' && j < i)) {
                return false;
            }

            // move to the next character after comparison
            i++;
            j++;
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter The Start String : ");
        String start = sc.nextLine();
        System.out.println();

        System.out.print("Enter The Target String : ");
        String target = sc.nextLine();
        System.out.println();

        boolean ans = canChange(start, target);

        System.out.println(ans);

        sc.close();
    }
}