C. Digital Logarithm.cpp

#include <bits/stdc++.h>

using namespace std;

priority_queue <int> a, b;
int t, n, x;

int f(int val){
    int res = 0;
    while(val) val /= 10, res++;
    return res;
}

int main(){
    cin.tie(nullptr), ios::sync_with_stdio(false);
    cin >> t;
    while(t--){
        cin >> n;
        for(int i = 0; i < n; i++){
            cin >> x;
            a.push(x);
        }
        for(int i = 0; i < n; i++){
            cin >> x;
            b.push(x);
        }

        int ans = 0;

        while(!a.empty()){
            int val1 = a.top(), val2 = b.top();
            a.pop(), b.pop();
            if(val1 > val2){
                a.push(f(val1));
                b.push(val2);
                ans++;
            }else if(val1 < val2){
                a.push(val1);
                b.push(f(val2));
                ans++;
            }
        }

        cout << ans << "\n";
    }
}