RLE code

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

string my_to_string(int n){
    string ans;
    while( n > 0 ){
        ans += (n % 10 + '0');
        n /= 10;
    }
    reverse(ans.begin(), ans.end());
    return ans;
}

string decode(string code){
    int p = 0;
    string ans, tmp;
    while( p < code.size() ){
        if(code[ p ] >= 'a' and code[ p ] <= 'z'){
            int ile = stoi(tmp);
            while( ile -- ) ans += code[ p ];
            tmp = "";
        }
        else{
            tmp += code[ p ];
        }
        p ++;
    }
    return ans;
}

int main()
{

    string s;
    cin >> s;
    string ans;
    int p = 0;
    while( p < s.size() ){
        int k = p;
        while(s[ p ] == s[ k ]){
            k ++;
        }
        int ile = k - p;
        ans += my_to_string( ile );
        ans += s[ p ];
        p = k;
    }
    cout << ans << endl;
    cout << decode( ans ) << endl;


    cout << endl;
    return 0;
}