题解 | #密码截取#没有用动态规划

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
    const isDuiChen = (str) => {
        let n = str.length;
        let mid = parseInt(n / 2);
        let str1 = str.slice(0, mid);
        let str2;
        if (n % 2 !== 0) str2 = str.slice(mid + 1, n);
        else str2 = str.slice(mid, n);
        let m = str1.length;
        let i = 0;
        for (let j = m - 1; j >= 0; j--) {
            if (str1[i] !== str2[j]) break;
            i++;
        }
        return i === m ? true : false;
    };

    while ((line = await readline())) {
        let n = line.length;
        let mid = parseInt(n / 2);
        if (n === 1) {
            console.log(1);
        } else {
            let result = 1;
            for (let temp = n; temp >= 2; temp--) {
                for (let i = 0; i < n - 1; i++) {
                    if (i + temp > n) break;
                    let str = line.slice(i, i + temp);
                    if (isDuiChen(str)) {
                        result = temp;
                        break;
                    }
                }
                if (result !== 1) break;
            }
            console.log(result);
        }
    }
})();