题解 | #密码截取#

import java.util.Scanner

fun main(args: Array<String>) {
       fun max(a:Int, b:Int) = Math.max(a, b)
    val read = Scanner(System.`in`)
    val res = read.nextLine()
    var max = 0
    for (i in res.indices) {
        max = max(max, getLongest(res, i, i))
        max = max(max, getLongest(res, i, i + 1))
    }
    println(max)
}

fun getLongest(res: String, l1: Int, r1: Int): Int {
    var l = l1
    var r = r1
    while (l>=0 && r<=res.lastIndex && res[l] == res[r]) {
        l --
        r ++
    }
    return r - l + 1 -2
}