#!/usr/bin/env python3

import sys
from math import inf

gares = sys.argv[1:]

N = len(gares)

if N < 2:
    print("Ben reste chez toi alors.")
    sys.exit(1)

def trajet_str(a, b):
    return f"{gares[a]} → {gares[b]}"

def chemin_str(stack):
    return ", ".join([trajet_str(stack[i], stack[i+1]) for i in range(len(stack)-1)])

# Demande des prix des trajets

prices = dict()

for i in range(N):
    for j in range(N-1, i, -1):
        print(trajet_str(i, j))
        p = None
        while not isinstance(p, float):
            try:
                p = float(input(f"Prix du trajet {trajet_str(i, j)} ? ").replace(',', '.'))
            except ValueError:
                print("C'est pas un prix ça !")
        if i not in prices:
            prices[i] = dict()
        prices[i][j] = float(p)

# Calcul des prix des chemins

miniPrice = +inf
miniStack = None
maxiPrice = -inf
maxiStack = None

def register_path(stack):
    price = sum([prices[stack[i]][stack[i+1]]for i in range(len(stack)-1)])

    global miniPrice, maxiPrice, miniStack, maxiStack
    if price < miniPrice:
        miniPrice = price
        miniStack = stack.copy()
    if price > maxiPrice:
        maxiPrice = price
        maxiStack = stack.copy()
    print(f"{chemin_str(stack)} = {price:.2f} €")

stack = [0]
while stack[0] == 0:
    if stack[-1] >= N - 1:
        register_path(stack)
        stack.pop()
        stack[-1] += 1
    else:
        stack.append(stack[-1]+1)

print(f"Prix minimum: {chemin_str(miniStack)} = {miniPrice:.2f} €")
print(f"Prix maximum: {chemin_str(maxiStack)} = {maxiPrice:.2f} €")