题目来源：

https://vjudge.net/contest/290636#problem/H

https://ac.2333.moe/Problem/view.xhtml?id=1226

题目描述：

In this problem you need to make a triangle ,just like the sample out. The element in the ith row and jth column

should be the product(乘积) of i and j.

Input

The first line of input is an integer C which indicate the number of test cases.
Then C test cases follow.Each test case contains an integer N (1<=N<=20) in a line which mentioned above.

Output

For each test case, print out the triangle. the triangle separated by a blank line.
If the product is more than 9 (product > 9) you should print a space, or you should print two space.The final number of each line don't need print space.

Sample Input

3
5
6
7

Sample Output

1  2  3  4  5
2  4  6  8
3  6  9
4  8
5

1  2  3  4  5  6
2  4  6  8  10
3  6  9  12
4  8  12
5  10
6

1  2  3  4  5  6  7
2  4  6  8  10 12
3  6  9  12 15
4  8  12 16
5  10 15
6  12
7

Hint

无

思路：没有思路，水题，因为没有看清题目描述，就一直PE，QAQ

参考代码：

#include<iostream>
using namespace std;
int main()
{
    int t,n;
    while(cin>>t)
    {
        while(t--)
        {
            cin>>n;
            for(int i = 1; i<=n; i++)
            {
                int t=0;
                for(int j=i; t<(n-i+1); j+=i)
                {
                    t++;
                    if(j==i)
                        cout<<j;
                    else
                    {
                        if((j>9)&&(j-i>9))
                            cout<<" "<<j;
                        else
                            cout<<"  "<<j;
                    }
                }
                cout<<endl;
            }
            if(t)cout<<endl;
        }
    }
    return 0;
}