[PAT解题报告] Hello World for U

#include <cstdio>
#include <cstring>
#include <string>
using namespace std;

char s[99];
int main() {
    scanf("%s",s);
    int n = strlen(s), n2 = (n + 4) / 3, n1;
    if ((n - n2) & 1) {
        ++n2;
    }
    n1 = (n - n2) >> 1;
    int from = 0, to = n - 1;
    for (int i = 0; i < n1; ++i, ++from, --to) {
        putchar(s[i]);
        for (int j = 2; j < n2; ++j) {
            putchar(' ');
        }
        printf("%c\n",s[n - 1 - i]);
    }
    for (; from <= to; ++from) {
        putchar(s[from]);
    }
    puts("");
    return 0;
}