题解 | #自守数#

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

void async function () {
    let input = parseInt(await readline());
    let res = 0;
    for(let i=0;i<=input;i++){
        let temp = i**2;
        temp = temp.toString();
        if(temp.endsWith(i.toString())){
            res +=1;
        }  
    }
    console.log(res);
}()