Snake mall

import sys

def solve():
    input_data = sys.stdin.read().split()
    if not input_data:
        return
    
    n = int(input_data[0])
    a = [float(x) for x in input_data[1:n+1]]
    
    indexed_shops = sorted([(a[i], i) for i in range(n)])
    
    positions = [0.0]*n
    right_now = 0.0
    left_now = 0.0
    total_distance = 0.0
    
    #alternate from 1(smallest after ordering)
    for rank, (width, orig_idx) in enumerate(indexed_shops):
        if rank%2 == 0:
            positions[orig_idx] = right_now
            total_distance+=right_now
            right_now+=width
        else:
            left_now-=width
            positions[orig_idx] = left_now
            total_distance+=abs(left_now+width)
            
    #has to be minimum
    avg_distance = total_distance/n
    print(f"{avg_distance:.6f}")
    print(" ".join(f"{pos:.6f}" for pos in positions))

if __name__ == '__main__':
    solve()

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