Postman and LLM

You own a delivery company in a city, which can be represented as a number line, starting at $0$ and extending to $+\infty$. In this city, there are $N$ houses, where the $i$-th house is located at district $d_i$. There is a postman, who can deliver to $M$ houses ($M \leq N$). The postman is bored and wants to have some fun. He first receives $M$ indices, $i_1, i_2, \ldots, i_M$, of the houses