提出 #58678343

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ソースコード 拡げる

import kotlin.math.sqrt

fun main() {
    val n = readln().toInt()
    val xy = List(n) {
        val (x, y) = readln().split(" ").map { it.toLong() }
        x to y
    }

    var ans = 0.0

    var current = 0L to 0L

    for((x, y) in xy) {
        val (a, b) = current
        val d = calc(a, b, x, y)
        ans += d

        current = x to y
    }

    val (a, b) = current
    ans += calc(a, b, 0, 0)

    println(ans)
}

fun calc(a: Long, b: Long, c: Long, d: Long): Double {
    val diff1 = a - c
    val diff2 = b - d

    return sqrt((diff1 * diff1 + diff2 * diff2).toDouble())
}

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