rt. 是https://www.luogu.com.cn/paintBoard/paint吗? 还有怎么用?
https://www.luogu.com.cn/paintBoard/paint
https://www.luogu.com.cn/paintBoard/paint?x=0&y=0&color=0?
https://www.luogu.com.cn/paintBoard/paint?x=0&y=0&color=0
