问如何在字符串数组中存储更多的字符串

EN

#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
int main()
{
    std::vector<int> v;
    long int a1[1000000];
    string a[1000000];
    for (int i=0; i<100; i++)
        a[i]=" ";
    int n;
    cout << "enter the value of n";
    cin >> n;
    for (int i=0; i<n; i++)
    {
        cin >> a1[i];
        v.push_back(a1[i]);
    }
    sort(v.begin(), v.end());
    char ch[100];
    int i=0;
    do { 
        for(int j=0; j<n; j++)
        {
            ch[j] = v[j] + '0';
            // cout<<ch[j];
        }
        int j=3;
        int k=0;
        for(int l=0; l<n; l++)
        {
            a[i] = a[i] + ch[l];
        }
        cout << a[i] << endl;
        i++;
    }
    while (std::next_permutation(v.begin(), v.end()));
    cout << endl << i;
}