A1031 Hello World for U (20 分| 字符串处理，附详细注释，逻辑分析)

写在前面

• 思路分析

• 

• 10分钟a题，不再赘述（水题）

测试用例

input:
helloworld!

output:
h   !

ac代码

• 直接输出

#include<iostream>
#include<string>
using namespace std;
int main()
{
    string s;
    cin >> s;
    int len = s.length(), lrhigh = (len+2) / 3, bottom = len - 2 * lrhigh;
    for (int i = 0; i < lrhigh-1; i++)
    {
        printf("%c", s[i]);
        for (int k = bottom; k >0; k--)printf(" ");
        printf("%c", s[len - 1 - i]);
        printf("\n");
    }
    for (int i = lrhigh - 1; i <= lrhigh + bottom; i++)
        printf("%c", s[i]);
    return 0;
}

• ​​参考代码​​