g0701_0800.s0790_domino_and_tromino_tiling

Class Solution

java.lang.Object

g0701_0800.s0790_domino_and_tromino_tiling.Solution

public class Solution
extends Object

790 - Domino and Tromino Tiling.

Medium

You have two types of tiles: a 2 x 1 domino shape and a tromino shape. You may rotate these shapes.

Given an integer n, return the number of ways to tile an 2 x n board. Since the answer may be very large, return it modulo 109 + 7.

In a tiling, every square must be covered by a tile. Two tilings are different if and only if there are two 4-directionally adjacent cells on the board such that exactly one of the tilings has both squares occupied by a tile.

Example 1:

Input: n = 3

Output: 5

Explanation: The five different ways are show above.

Example 2:

Input: n = 1

Output: 1

Constraints:

• 1 <= n <= 1000

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	numTilings(int n)

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

numTilings

public int numTilings(int n)