#include<iostream>
#include<string>
using namespace std;
int main() { //1 3 5 7 2n-1
char c;
cin >> c; //输入范围:字符:A-Z 数字:1-9
if (c >= 'A' && c <= 'Z') {
int num = c - 'A' + 1; //行数
for (int i = 1; i <= num; i++) { //循环输出每行
for (int j = 1; j <= num - i; j++) { //前空格
cout << " ";
}
for (char x = 'A'; x <= 'A' + i - 1; x++) { //中加前半段字符
cout << x;
}
for (char x = 'A' + i - 2; x >= 'A'; x--) { //后半段字符
cout << x;
}
for (int j = 1; j <= num - i; j++) { //后空格
cout << " ";
}
cout << "" << endl;
}
}
else {
int num = c - 48;
for (int i = 1; i <= num; i++) { //循环输出每行
for (int j = 1; j <= num - i; j++) {
cout << " ";
}
for (int x = 1; x <= i; x++) {
cout << x;
}
for (int x = i - 1; x >= 1; x--) {
cout << x;
}
for (int j = 1; j <= num - i; j++) {
cout << " ";
}
cout << "" << endl;
}
}
return 0;
}
//00100
//01210
//12321
测试结果: