能不能帮我看一下这道题为什么格式错误？

[qq_40669215]

题目如下：

我的代码：

#include <cmath>
#include <cstdio>
#include <iostream>
#include <vector>
#include <cstring>
#include <cctype>
using namespace std;
char digit[10][5] = {"ling", "yi", "er", "san", "si", "wu", "liu", "qi", "ba", "jiu"};
char wei[3][5] = {"Qian", "Bai", "Shi"};
char da_wei[2][5] = {"Yi", "Wan"};
int main(void)
{
    // freopen("data.in", "r", stdin);
    string num;
    cin >> num;
    if(num.at(0) == '-')
    {
        printf("Fu ");
        num = num.substr(1);
    }
    int group[3];
    memset(group, -1, 3 * sizeof(int));
    int n = num.size();
    if(n == 1)
    {
        printf("%s", digit[num.at(0) - '0']);
    }
    else
    {    
        int k = 0;
        while(1)
        {
            if(n < 0) break;
            if(n >= 4)
            {
                group[k++] = 4;
            }
            else
            {
                group[k++] = n;
            }
            n -= 4;
        }
        for(int i = 2; i >= 0; --i)
        {
            if(group[i] <= 0) continue;
            static int u = 0;
            int sig = 0;
            int wei_begin = 4 - group[i];
            for(int j = 0; j < group[i]; ++j)
            {
                if(isdigit(num.at(u + j)))
                {
                    int subtract = num.at(u + j) - '0';
                    if(j == group[i] - 1 && subtract == 0) continue;
                    if(u + j == 0)
                    {
                        printf("%s", digit[subtract]);
                        sig = 1;
                    }
                    else if(subtract != 0 || num.at(u + j + 1) != '0')
                    {
                        printf(" %s", digit[subtract]); 
                        sig = 1;
                    }    
                    if(j != group[i] - 1 && subtract != 0)
                    {
                        printf(" %s",wei[wei_begin + j]);
                    }
                }
            }
            u+=group[i];
            if(sig)
                printf(" %s", da_wei[2 - i]);
        }
    }
}

提交的结果：

我用几组数据和别人的AC对比都没有区别啊

[Tryagain2006]

估计是应该在输出的后面增加一个回车符。