题解 | #密码截取#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    // Write your code here
    while(line = await readline()){
        let s = line.length;
        let maxLength = 0;
        for (let i = 0; i < 2*s -1; i++) {
            let start = Math.floor(i / 2), end = Math.ceil(i / 2)
            // console.log(i, start, end)
            while (start <= end && start >= 0 && end < s 
                && line.charAt(start) ===  line.charAt(end)) {
                    maxLength = Math.max(maxLength, end - start + 1);
                    // console.log(start, end, maxLength, '-----') 
                    start--;
                    end++;
                }
        }
        console.log(maxLength)
    }
}()