Submission #954997

---

Source Code Expand

fun main(args: Array<String>) {
    val (n, x) = readLine()!!.split(' ').map(String::toInt)
    if (x == 1 || x == 2 * n - 1) {
        println("No")
        return
    }
    if (n == 2) {
        println("Yes")
        println("1 2 3")
        return
    }
    val ans = IntArray(2 * n - 1)
    val range : IntRange
    if (x == 2 * n - 2) {
        ans[n - 2] = x - 1
        ans[n - 1] = x + 1
        ans[n] = x
        ans[n + 1] = x - 2
        range = IntRange(x - 2, x + 1)
    } else {
        ans[n - 2] = x + 1
        ans[n - 1] = x - 1
        ans[n] = x
        ans[n + 1] = x + 2
        range = IntRange(x - 1, x + 2)
    }
    var j = 1
    for (i in ans.indices) {
        if (ans[i] == 0) {
            while (j in range) j++
            ans[i] = j++
        }
    }
    println("Yes")
    ans.forEach { println(it) }
}

Submission Info

Judge Result