LeetCode 1540: Can Convert String in K Moves Solution

Master LeetCode problem 1540 (Can Convert String in K Moves), 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.

1540. Can Convert String in K Moves

Medium

Hash Table String

Problem Explanation

Explanation:

To solve this problem, we need to check if it is possible to convert string s into string t in no more than k moves. We can achieve this by iterating through each character in both strings and calculating the minimum number of moves required to convert each character from s to t.

We calculate the difference between the characters at each position in s and t. If the difference is negative, we loop back to 'a' by adding 26 to the difference.
We update the count of moves required to shift the character at each position.
Finally, we check if the total moves required to convert all characters in s to t is less than or equal to k.

Time Complexity: O(n), where n is the length of the input strings s and t. Space Complexity: O(26) = O(1)

Solution Code

class Solution {
    public boolean canConvertString(String s, String t, int k) {
        if (s.length() != t.length()) {
            return false;
        }

        int[] shifts = new int[26];
        for (int i = 0; i < s.length(); i++) {
            int diff = t.charAt(i) - s.charAt(i);
            if (diff < 0) {
                diff += 26;
            }
            shifts[diff]++;
        }

        for (int i = 1; i < 26; i++) {
            if (i + (shifts[i] - 1) * 26 > k) {
                return false;
            }
        }

        return true;
    }
}

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