题解

#include<iostream>
using namespace std;
int a[30][30];
int main(){
    a[2][1]=a[2][2]=1;
    int n;
    cin>>n;
    cout<<1<<endl;
    if(n>=2){
        cout<<1<<" "<<1<<endl;
    }
    for(int i=3;i<=n;i++){
        for(int j=1;j<=i;j++){
            a[i][j]=a[i-1][j-1]+a[i-1][j];
            cout<<a[i][j];
            if (j!=i){
                cout<<" ";
            }
        }
        if (i!=n){
            cout<<endl;
        }
    }
    return 0;
}