c++實現特殊數字矩陣

#include<iostream>
#include<iomanip>
using namespace std;
void main(){
	int i,j,a[100][100],n,k;
	cout<<"input the width of the matrix:";
	cin>>n;
	k=1;
	for(i=1;i<=n;i++){
		for(j=1;j<=n+1-i;j++){
			a[i-1+j][j]=k;
			k=k+1;
		}
	}
	for(i=1;i<=n;i++){		
		for(j=1;j<=i;j++){
			cout<<setw(4)<<a[i][j]<<" ";
		}
		cout<<endl;
	}
	return ;
}