PAT1035 Password

Sample Input 1:

3
Team000002 Rlsp0dfa
Team000003 perfectpwd
Team000001 R1spOdfa

Sample Output 1:

2
Team000002 RLsp%dfa
Team000001 R@spodfa

Sample Input 2:

1
team110 abcdefg332

Sample Output 2:

There is 1 account and no account is modified

Sample Input 3:

2
team110 abcdefg222
team220 abcdefg333

Sample Output 3:

There are 2 accounts and no account is modified

#include <iostream>
#include <string>
#include <iomanip>
#include <vector>
using namespace std;

struct USERINFO
{
    string username;
    string password;
    int flag;
    USERINFO()
    {
        flag = 0;
    }
};

int IsModify(string &password)
{
    int flag = 0;
    for (int i = 0; i < password.length(); i++)
    {
        switch (password[i])
        {
        case '1':
            password[i] = '@';
            flag = 1;
            break;
        case '0':
            password[i] = '%';
            flag = 1;
            break;
        case 'l':
            password[i] = 'L';
            flag = 1;
            break;
        case 'O':
            password[i] = 'o';
            flag = 1;
            break;
        default:
            break;
        }
    }

    return flag;
}

int main()
{
    int N;
    cin>>N;
    int count = 0;
    vector<USERINFO> V;
    for (int i = 0; i < N; i++)
    {
        USERINFO info;
        cin>>info.username>>info.password;
        info.flag = IsModify(info.password);
        if (info.flag == 1)
        {
            count++;
        }   
        V.push_back(info);
    }

    if (count == 0)
    {
        if (N > 1)
        {
            cout<<"There are "<<N<<" accounts and no account is modified";
        }
        else
        {
            cout<<"There is 1 account and no account is modified";
        }
        return 0;
    }

    cout<<count<<endl;
    for (int i = 0; i < N; i++)
    {
        if (V[i].flag == 1)
        {
            cout<<V[i].username<<" "<<V[i].password<<endl;
        }
    }

    return 0;
}