LeetCode 3248: Snake in Matrix Solution

Master LeetCode problem 3248 (Snake in Matrix), 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.

3248. Snake in Matrix

Easy

Array String Simulation

Problem Explanation

Explanation:

To solve this problem, we can simulate the movement of the snake based on the given commands. We maintain the current position of the snake and update it according to each command. We need to handle the boundary conditions to ensure that the snake stays within the grid.

Algorithm:

Initialize variables for current position (start at cell 0), and iterate through each command.
For each command:
- Update the position based on the command direction.
- Check if the new position is within the grid boundaries.
Return the final position of the snake.

Time Complexity:

The time complexity of this solution is O(n), where n is the number of commands given.

Space Complexity:

The space complexity is O(1) as we are not using any additional data structures. :

Solution Code

class Solution {
    public int finalPosition(int n, String[] commands) {
        int position = 0;
        
        for (String command : commands) {
            switch (command) {
                case "UP":
                    if (position - n >= 0) {
                        position -= n;
                    }
                    break;
                case "RIGHT":
                    if ((position + 1) % n != 0) {
                        position++;
                    }
                    break;
                case "DOWN":
                    if (position + n < n * n) {
                        position += n;
                    }
                    break;
                case "LEFT":
                    if (position % n != 0) {
                        position--;
                    }
                    break;
            }
        }
        
        return position;
    }
}

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