UVA11973 Sierpinski Carpet

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=229&page=show_problem&problem=3124 [PDF](https://uva.onlinejudge.org/external/119/p11973.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11973/a6b6f3479158956a163912d32cc21d3e5bf08531.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11973/bafd8d4f386e790de62ba645ca860806fbe0f424.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11973/9f7a1142e1301943289ed5523ead1d5c4a5d3a71.png)