OIG XV - kul

// https://szkopul.edu.pl/problemset/problem/L7i-kY2Zz46AW3vnrxHOmn5T/site/?key=statement
// OIJ XV 3 etap próbne

#include <iostream>
#include <queue>
#include <vector>

int main() {
    std::ios_base::sync_with_stdio(0);
    std::cin.tie(0);
    std::cout.tie(0);

    int n;
    std::cin >> n;

    std::string s1, s2;
    std::cin >> s1 >> s2;

    int cC = 0, cB = 0;
    char looker = 'C';

    for (const auto& c : s1) {
        if (c == 'C') {
            cC++;
        } else {
            cB++;
        }
    }

    if (cC > cB) {
        looker = 'C';
    } else {
        looker = 'B';
    }

    std::queue<int> v;

    for (int i = 0; i < s2.size(); i++) {
        const auto& c = s2[i];

        if (c == looker) {
            v.push(i);
        }
    }

    long long ans = 0;

    for (int i = 0; i < s1.size(); i++) {
        const auto& c = s1[i];

        if (c != looker) {
            auto hj = v.front();
            v.pop();

            ans += abs(i - hj) + 1;
        }
    }

    std::cout << ans << '\n';

    return 0;
}