number triangle in c++
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin>>n;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n-i;j++)
{
cout<<" ";
}
for(int j=1;j<=i;j++)
{
cout<<j<<" ";
}
cout<<endl;
}
return 0;
}