LeetCode 2159: Order Two Columns Independently Solution

Master LeetCode problem 2159 (Order Two Columns Independently), 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.

2159. Order Two Columns Independently

Medium

Database

Problem Explanation

Explanation

To order two columns independently, we can combine the values from both columns into a single data structure (e.g., a tuple or a custom class) and then sort the data structure based on the values of the first column first, and then based on the values of the second column. This way, the values in the first column are ordered independently of the values in the second column.

Algorithmic Steps:

Combine the values of both columns into a data structure (e.g., tuple, class).
Sort the data structure based on the first column values.
For values with the same first column value, sort them based on the second column values.

Time Complexity:

The time complexity of this approach is O(n*log(n)), where n is the number of elements in the input columns.

Space Complexity:

The space complexity is O(n) to store the combined data structure.

Solution Code

import java.util.Arrays;
import java.util.Comparator;

class Solution {
    public int[][] orderTwoColumnsIndependently(int[][] columns) {
        Arrays.sort(columns, new Comparator<int[]>() {
            @Override
            public int compare(int[] a, int[] b) {
                if (a[0] != b[0]) {
                    return a[0] - b[0];
                } else {
                    return a[1] - b[1];
                }
            }
        });
        return columns;
    }
}

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