【蓝桥杯】BASIC-3 字母图形

#include <bits/stdc++.h>
using namespace std;
#define Up(i,a,b) for(int i = a; i <= b; i++)
#define Down(i,a,b) for(int i = a; i >= b; i--)

int main()
{
    int n,m;
    cin >> n >> m;
    string str = "";
    vector<string> v;
    Up(i,0,m-1)
    {
        str += 'A'+i; 
    }
    v.push_back(str);
    Up(i,1,n-1)
    {
        Down(j,m-1,i)   //从第i个字符开始把字符都右移i位
        {
            str[j] = str[j-1];
        }
        int cnt = 0;
        Down(j,i-1,0)
        {
            str[j] = str[i]+(++cnt);
        }
        v.push_back(str);
    }
    Up(i,0,v.size()-1)
    {
        cout << v[i] << endl;
    }
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
#define Up(i,a,b) for(int i = a; i <= b; i++)

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0),cout.tie(0);
    int n,m;    //n行m列
    cin >> n >> m;
    Up(i,1,n)
    {
        Up(j,1,m)
        {
            cout << char('A'+abs(i-j));
        }
        cout << endl;
    }
    return 0;
}