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!/bin/python3

import math import os import random import re import sys

if name == 'main': t = int(input().strip())

for i in range(t):
    first_multiple_input = input().rstrip().split()
    n = int(first_multiple_input[0])
    k = int(first_multiple_input[1])
    L = []
    L1 = []
    for i in range(n):
        L.append(i)
    l = 0
    r = n-1
    while l<r:
        L1.append(L[r])
        L1.append(L[l])
        l += 1
        r -= 1
    if l == r:
        L1.append(L[l])
    print(L1.index(k))

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One line solution :)

return k < n/2 ? (2*k + 1) : 2*(n - k - 1)

i don't understand problem ! who can be help me please !!!