#include <stdio.h>
#include <iostream>

using namespace std;

int main() {
    int N;
    cin >> N;
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < N - i; j++) printf(" ");
        for (int j = 0; j < i; j++) printf("%c", (char)(j + 'A'));
        for (int j = i; j >= 0; j--) printf("%c", (char)(j + 'A'));
        printf("\n");
    }
    return 0;
}

问题解决的话，请点下采纳