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g0701_0800.s0790_domino_and_tromino_tiling.readme.md Maven / Gradle / Ivy

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.

![](https://assets.leetcode.com/uploads/2021/07/15/lc-domino.jpg)

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:**

![](https://assets.leetcode.com/uploads/2021/07/15/lc-domino1.jpg)

**Input:** n = 3

**Output:** 5

**Explanation:** The five different ways are show above. 

**Example 2:**

**Input:** n = 1

**Output:** 1 

**Constraints:**

*   `1 <= n <= 1000`