C134

Qi Tianyun walked up to the top of the snowy mountain and slanted down. With a glance, he could see the edge of the snowy slope, which was not that steep, but it was covered with rocks of various sizes. If he was not careful and rolled down to his death, then it would be really ugly. He stood on the mountain and racked his brains for a long time, but he couldn't come up with a solution