题解 | #Hello World for U#

忽略多次输入，写于2024.3.18

#include <iostream>
#include <algorithm>
#include <cstring>
using namespace std;

int main()
{
    int i, j;
    string str;
    cin >> str;
    int len = str.size();
    int n1 = (len + 2) / 3; // 输的字符串的长度
    int n3 = len - 2 * (n1 - 1);
    for (i = 0; i <= n1 - 2; i++)
    {
        cout << str[i];
        for (j = 0; j < n3 - 2; j++)
        {
            cout << " ";
        }
        cout << str[len - 1 - i] << endl;
    }

    for (i = n1 - 1; i <= len - n1; i++)
    {
        cout << str[i];
    }
    cout << endl;

    return 0;
}