PTA 自测-4 Have Fun with Numbers

#include<iostream>
#include<string>
#include<cstring>
#include<vector>
using namespace std;
int main()
{
    int a[] = {}, b[] = {  };
    string str;
    vector<int>doublenum;//记录翻倍后的数值
    cin >> str;
    int length = str.length();
    int j = ;
    for (int i = ; i < length; i++)
    {
        int  num;
        num = str[i] - '';
        a[num]++;
    }
    int carry = ;
    for (int i = length-; i>=; i--)
    {
        int num = (str[i] - '') *  + carry;
        if (num >=)
            carry = ;
        else
            carry = ;
        int remainder = num % ;
        b[remainder]++;
        doublenum.push_back(remainder);
    }
    if (carry == )
        doublenum.push_back();
    bool judge = true;
    for (int i = ; i < ; i++)
    {
        if (a[i] != b[i])
        {
            judge = false;
            break;
        }
    }
    if (judge)
    {
        cout << "Yes" << endl;
    }
    else
    {
        cout << "No" << endl;
    }
    for (int i = doublenum.size()-; i>=; i--)
    {
        cout << doublenum[i];
    }
    return ;
}

1、用字符串记录数字

2、vector