Submission #1602578

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Source Code Expand

n, x = map(int,input().split())
if x == 1 or x == 2 * n - 1:
    print("No")
    exit()

print("Yes")
if n == 2:
    for i in range(1, 4):
        print(i)
    exit()

ans = []
if x == 2:
    l_x = [3, 2, 1, 4]
else:
    l_x = [x + 1, x, x - 1, x + 2]

i = 1
while len(ans) < n - 2:
    if i not in l_x:
        ans.append(i)
    i += 1

ans += l_x

while len(ans) < 2 * n:
    if i not in l_x:
        ans.append(i)
    i += 1

for i in range(2 * n - 1):
    print(ans[i])

Submission Info

Judge Result