Question

How to get the row of Pascal triangle given an integer rowIndex in Java

Answer 1

import java.util.ArrayList;
import java.util.List;

public class PascalTriangleRow {

    public static List<Integer> getPascalTriangleRow(int rowIndex) {
        List<Integer> row = new ArrayList<>();

        row.add(1); // First element is always 1

        for (int i = 1; i <= rowIndex; i++) {
            int prev = row.get(i - 1);
            int value = (int)(prev * (rowIndex - i + 1) / i); 
            row.add(value);
        }

        return row;
    }

    public static void main(String[] args) {
        int rowIndex = 4;
        List<Integer> row = getPascalTriangleRow(rowIndex);

        for (int num : row) {
            System.out.print(num + " ");
        }
    }
}



/*
run:

1 4 6 4 1 

*/

 

70+ SQL courses for beginners and professionals