Scrieti un program care sa afiseze aceasta piramida

#include <iostream>
using namespace std;
int main(){
int n,i,j,k;
cin >> n;
for(i=1;i<2*n;i++){
for(k=1;k<=2*n-i;k++) cout << " ";
for(j=1;j<=i;j++) cout << j << " ";
cout << endl;
}
}