21FA - 07 Cactus Farm

Porco the Porcupine has a farm and is trying to grow a line of cactuses to the right of his farm. The line has plots of soil in a line and a cactus seed in each. He also has a machine that holds a line of $n$ hoses such that hoses can hover above the $i$-th to $(i + n - 1)$-th (inclusive) plot for some $i$. If he activates the hoses, special water drops below which instantly grow the cactus seed.