题解 | #蛇形矩阵#

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())) {
        const n = parseInt(line);
        let arr = [1];       
        for (let i = 2; i <= n; i++) {
            arr.push(arr[arr.length - 1] + i)
        }

        for (let j = 0; j < n; j++) {
            let str = "";
           arr.slice(j).forEach(item =>{

            str += item -j + ' ';
           })
        console.log(str);
        }
    }
})();