Package g1901_2000.s1931_painting_a_grid_with_three_different_colors

Class Solution

java.lang.Object

g1901_2000.s1931_painting_a_grid_with_three_different_colors.Solution

public class Solution
extends Object

1931 - Painting a Grid With Three Different Colors.

Hard

You are given two integers m and n. Consider an m x n grid where each cell is initially white. You can paint each cell red , green , or blue. All cells must be painted.

Return the number of ways to color the grid with no two adjacent cells having the same color. Since the answer can be very large, return it modulo 109 + 7.

Example 1:

Input: m = 1, n = 1

Output: 3

Explanation: The three possible colorings are shown in the image above.

Example 2:

Input: m = 1, n = 2

Output: 6

Explanation: The six possible colorings are shown in the image above.

Example 3:

Input: m = 5, n = 5

Output: 580986

Constraints:

• 1 <= m <= 5
• 1 <= n <= 1000

Field Summary

Fields

Modifier and Type	Field	Description
static final int	P

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	colorTheGrid(int m, int n)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

P

public static final int P

See Also:

• Constant Field Values

Constructor Details

Solution

public Solution()

Method Details

colorTheGrid

public int colorTheGrid(int m,
 int n)