"""
name: Nicholas Tamassia

Honor Code and Acknowledgments:

        This work complies with the JMU Honor Code.

       Comments here on your code and submission.
"""

import pprint
from collections import defaultdict
from math import sqrt

type Coordinate = tuple[float, float]
type CoordMap = dict[int, Coordinate]
type WeightedGraph = dict[int, dict[int, float]]


def distance(a: Coordinate, b: Coordinate) -> float:
    x1, y1 = a
    x2, y2 = b
    return sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)


def create_graph(coords: CoordMap) -> WeightedGraph:
    graph: WeightedGraph = defaultdict(dict)

    coord_items = coords.items()

    for label1, coord1 in coord_items:
        for label2, coord2 in coord_items:
            if label1 == label2:
                continue

            weight = distance(coord1, coord2)
            graph[label1][label2] = weight
            graph[label2][label1] = weight

    return graph


def calculate_cost(graph: WeightedGraph) -> float:
    cost: float = 0.0

    return cost


# All modules for CS 412 must include a main method that allows it
# to imported and invoked from other python scripts
def main():
    n: int = int(input())

    coords: CoordMap = {}

    for i in range(0, n):
        tokens = input().split()
        coords[i] = (float(tokens[0]), float(tokens[1]))

    weighted_graph = create_graph(coords)

    pprint.pprint(weighted_graph)

    # print(f"${cost:.1f}M")


if __name__ == "__main__":
    main()