https://www.acmicpc.net/problem/2443
const fs=require('fs') n=parseInt(fs.readFileSync(0).toString()) for(i=n;i>=1;i--){ for(j=0;j<n-i;j++) process.stdout.write(" "); for(j=0;j<(i-1)*2+1;j++) process.stdout.write("*"); console.log(); }