Submission #68922596

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Source Code Expand

#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <cmath>
#include <bitset>
#include <numeric>
using namespace std;
#define ll long long
#define vi vector<int>
#define vs vector<string>
#define vll vector<long long>
#define vii vector<pair<int, int>>
#define vllvector vector<pair<ll, ll>>
#define vb vector<bool>
#define yes cout << "Yes" << endl;
#define no cout << "No" << endl;
#define rep(i, n) for (ll i = 0; i < n; i++)

int main() {
    ll n;
    string s;
    cin >> n >> s;

    vll a, b;
    rep(i, 2 * n) {
        if (s[i] == 'A') {
            a.push_back(i);
        } else {
            b.push_back(i);
        }
    }

    ll ans = 0;
    rep(i, n) {
        ans += abs(a[i] -2 * i);
    }

    ll ans_ = 0;
    rep(i, n) {
        ans_ += abs(a[i] - (2 * i+ 1));
    }

    cout<< min(ans, ans_) << endl;
}

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