diff options
Diffstat (limited to 'domino_tromino_tiling.cpp')
-rw-r--r-- | domino_tromino_tiling.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/domino_tromino_tiling.cpp b/domino_tromino_tiling.cpp new file mode 100644 index 0000000..80a97d0 --- /dev/null +++ b/domino_tromino_tiling.cpp @@ -0,0 +1,28 @@ +#include "leetcode.h" +#include <vector> + +class Solution { +public: + int numTilings(int n) { + int mod = 1e9; + mod += 7; + vector<long long> ans(1001, 0); + ans[1] = 1; + ans[2] = 2; + ans[3] = 5; + if (n <= 3) + return ans[n]; + for (int i = 4; i <= n; ++i) { + ans[i] = 2 * ans[i - 1] + ans[i - 3]; + ans[i] %= mod; + } + return ans[n]; + } +}; + +int main() { + Solution obj; + cout << obj.numTilings(3); // 5 + cout << endl; + cout << obj.numTilings(1); // 1 +} |