已AC，放心食用

#include <iostream>
#include <cstdio>
using namespace std;
int main(){
	int n;
	cin>>n;
	for(int i=0;i<n;i++){
		for(int j=0;j<n-i;j++)
			cout<<"    "<< j+1;
		cout<<endl;
		for(int k=0;k<=i;k++)
			cout<<"     ";
	}
	return 0;
}

#include <bits/stdc++.h> using namespace std; int n; int a[101][101]; int main() { cin >> n; for (int i = 1; i <= n; i++) { for (int j = 1; j <=i-1; j++) cout<<setw(3)<<" "; for (int j = 1; j <=n-i+1; j++){ a[i][j]=j; cout << setw(3) << a[i][j]; } cout << endl; } return 0; }