https://www.acmicpc.net/problem/10992
const fs=require('fs')
n=parseInt(fs.readFileSync(0).toString())
for(i=1;i<n;i++){
for(j=n-i;j>0;j--) process.stdout.write(" ");
process.stdout.write("*");
for(j=0;j<(i-2)*2+1;j++) process.stdout.write(" ");
if(i!=1) process.stdout.write("*");
console.log();
}
for(i=0;i<(n-1)*2+1;i++) process.stdout.write("*");