<s>[INST] class Solution:
    def minCostToSupplyWater(self, n: int, wells: List[int], pipes: List[List[int]])

Here is the problem:

There are `n` houses on a street, and there are `n` wells. Each house can be connected to a well or to the next house. The cost to connect a house to a well is `wells[i]`. The cost to connect a house to the next house is `pipes[i][2]`. `pipes[i][0]` is the first house, `pipes[i][1]` is the second house, and `pipes[i][2]` is the cost to connect these two houses.

Your task is to find the minimum cost to connect all houses to a well or the next house.

This problem is a min spanning tree problem.

Here is my solution:

```python
class Solution:
    def minCostToSupplyWater(self, n: int, wells: List[int], pipes: List[List[int]])

    def find_root(self, x, parent):
        if parent[x] == x:
            return x
        else:
            return self.find_root(parent[x], parent)

    def minCostToSupplyWater(self, n: int, wells: List[int], pipes: List[List[int]]) -> int:
        parent = [i for i in range(n + 1)]
        rank = [1 for _ in range(n + 1)]
        edges = []

        for i, w in enumerate(wells):
            edges.append((w, 0, i + 1))
        for p in pipes:
            edges.append((p[2], p[0], p[1]))

        edges.sort()

        res = 0
        for w, u, v in edges:
            root_u = self.find_root(u, parent)
            root_v = self.find_root(v, parent)

            if root_u != root_v:
                if rank[root_u] > rank[root_v]:
                    parent[root_v] = root_u
                else:
                    parent[root_u] = root_v
                    if rank[root_u] == rank[root_v]:
                        rank[root_v] += 1
                res += w
        return res
```

It seems to work, but I'm not sure about my implementation. Can you review and improve it?[/INST]