explain two problem-solving techniques the men used to survive against the wolves.

The men lit fires to keep the wolves at a safe distance.

But the wolves were growing bolder, and the men were aroused more than once from their sleep.  So near did the wolves approach, that the dogs became frantic with terror, and it was necessary to replenish the fire from time to time in order to keep the adventurous marauders at safer distance.

They used their guns. 

Gun in hand, he plunged into the underbrush that lined the side of the trail.  His intention was apparent enough.  Taking the sled as the centre of the circle that One Ear was making, Bill planned to tap that circle at a point in advance of the pursuit.  With his rifle, in the broad daylight, it might be possible for him to awe the wolves and save the dog.