#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int a[105][105];
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= i; j++)
        {
            if (j == 1 || i == j)
                a[i][j] = 1;
            else
                a[i][j] = a[i - 1][j] + a[i - 1][j - 1];
            cout << a[i][j] << " ";
        }
        cout << endl;
    }
}

#include <iostream>
int main(){
    int n,a[25][25]; std::cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=i;j++){
            if(j==1||j==i)a[i][j]=1;
            else a[i][j]=a[i-1][j-1]+a[i-1][j];}}
    for(int i=1;i<=n;i++){
        for(int j=1;j<=i;j++)
            std::cout<<a[i][j]<<" ";
        puts("");}
    return 0;}

#include<cstdio>
int a[21][21];
int main()
{
int n;
scanf("%d",&n);
for(int i=1;i<=n;i++)
a[i][1]=a[i][i]=1;//赋初值
for(int i=1;i<=n;i++)
for(int j=2;j<i;j++)//因为a[i][1]、a[i][i]已经赋值过了，所以循环是2~n-1
a[i][j]=a[i-1][j]+a[i-1][j-1];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=i;j++)
printf("%d ",a[i][j]);
printf("\n");
}
}

#include<iostream>
using namespace std;
int a[35][35];
int main()
{
    int n;
    cin >> n;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=i;j++)
        {
            if(j==1 || j==i)
            {
                a[i][j]=1;
            }
            else
            {
                a[i][j]=a[i-1][j-1]+a[i-1][j];
            }
        }
    }
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=i;j++)
        {
            cout << a[i][j] << " ";
        }
        cout << endl;
    }
    return 0;
}

部分代码：

for(ll i=0;i<n;i++){
    f[i][0]=1;
    for(ll j=1;j<=i;j++)
        f[i][j]=f[i-1][j]+f[i-1][j-1];
    for(ll j=0;j<=i;j++)
        printf("%lld%c",f[i][j],j==i?'\n':' ');
}

upd. 将原代码替换为了老师课上讲的代码，虽然原代码好像没什么问题，但是套在这一题上好像就有问题了。还是背这个板子把

#include<iostream>
int n;
int f[21][21];
int main()
{
    std::cin>>n;
    for(int i=1;i<=n;i+=1)for(int j=1;j<=i;j+=1)if(j==1||j==i)f[i][j]=1;else f[i][j]=f[i-1][j-1]+f[i-1][j];
    for(int i=1;i<=n;i+=1)
    {
        for(int j=1;j<=i;j+=1)std::cout<<f[i][j]<<" ";
        std::cout<<"\n";
    }
}

超级简单易懂

#include <bits/stdc++.h>
using namespace std;
int a[25][25];
int main()
{
    int n;
    cin >> n;
    for(int i = 1;i <= n;i++)
    {
        for(int j = 1;j <= i;j++)
        {
            if(j == 1 ||j == i)
            {
                a[i][j] = 1;
            }
            else
            {
                a[i][j] = a[i-1][j-1]+a[i-1][j];
            }
            cout << a[i][j] << " ";
        }
        cout << endl;
    }
}