可以直接把图建出来跑欧拉回路，或者手动构造：先一直走到左下，然后每一层先直线走到最右边，再沿着斜线走一条锯齿状的路径到左边的上一层。
如图所示：
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QOJ
Discussion #1222 for Problem #17171. Traversal of a Triangular Grid
Type: Editorial
Status: Open
Posted by: jiangly
Posted at: 2026-03-06 01:31:59
Last updated: 2026-03-06 01:32:05
题解
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