LeetCode 2566: Maximum Difference by Remapping a Digit Solution

Master LeetCode problem 2566 (Maximum Difference by Remapping a Digit), 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.

2566. Maximum Difference by Remapping a Digit

Easy

Math Greedy

Problem Explanation

Explanation:

To solve this problem, we need to consider all possible digit remappings and calculate the maximum and minimum values that can be obtained by remapping a single digit. We will iterate through all digits from 0 to 9, and for each digit, we will calculate the maximum and minimum values that can be obtained by remapping that digit to another digit. Finally, we will return the maximum difference between the maximum and minimum values.

Algorithmic Idea:

Iterate through all digits from 0 to 9.
For each digit, calculate the maximum value by replacing all occurrences of that digit with 9 and the minimum value by replacing all occurrences of that digit with 0.
Update the maximum difference if the difference between the maximum and minimum values is greater than the current maximum difference.
Return the maximum difference.

Time Complexity:

The time complexity of this solution is O(N), where N is the number of digits in the input number.

Space Complexity:

The space complexity of this solution is O(1) as we are using constant extra space.

Solution Code

class Solution {
    public int maxDiff(int num) {
        String numStr = String.valueOf(num);
        int maxDiff = 0;
        
        for (char c = '0'; c <= '9'; c++) {
            String replaceWith9 = numStr.replace(c, '9');
            String replaceWith0 = numStr.replace(c, '0');
            
            if (c != '0' && replaceWith0.charAt(0) != '0') {
                int diff = Integer.parseInt(replaceWith9) - Integer.parseInt(replaceWith0);
                maxDiff = Math.max(maxDiff, diff);
            }
        }
        
        return maxDiff;
    }
}

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