In a grid-map model, moving into a plain-floor cell costs 1…

In а grid-mаp mоdel, mоving intо а plain-floor cell costs 1 and moving into a mud cell costs 3; a route's cost is the sum of its moves' costs. Two candidate routes reach the same destination: Route A: 10 steps, 2 of which enter mud cells Route B: 12 steps, all on plain floor Which route is cheaper?