Submission #1100730

#TimeUsernameProblemLanguageResultExecution timeMemory
1100730Kirill22Cheerleaders (info1cup20_cheerleaders)C++17
46 / 100
1215 ms2788 KiB
#include "bits/stdc++.h"

using namespace std;

//#include "debug.h"

void solve() {
    int k;
    cin >> k;
    int n = 1 << k;
    vector<int> arr(n), f(n);
    for (int i = 0; i < n; i++) {
        cin >> arr[i];
    }
    long long ans = (long long) 1e18;
    for (int iter = 0; iter < k; iter++) {
        vector<int> a(n);
        for (int i = 0; i < n; i++) {
            a[i / 2 + (i % 2 ? (1 << (k - 1)) : 0)] = arr[i];
        }
        arr = a;
        long long res = 0;
        for (int len = 1; len <= n / 2; len *= 2) {
            long long L = 0, R = 0;
            for (int i = 0; i < n; i += len * 2) {
                long long val = 0;
                for (int j = i + len; j < i + len * 2; j++) {
                    for (int x = a[j]; x < n; x |= (x + 1)) {
                        f[x]++;
                    }
                }
                for (int j = i; j < i + len; j++) {
                    val += len;
                    for (int x = a[j]; x >= 0; x = (x & (x + 1)) - 1) {
                        val -= f[x];
                    }
                }
                for (int j = i + len; j < i + len * 2; j++) {
                    for (int x = a[j]; x < n; x |= (x + 1)) {
                        f[x]--;
                    }
                }
                L += val;
                R += len * 1ll * len - val;
            }
            res += min(L, R);
        }
        ans = min(ans, res);
    }
    cout << ans << '\n';
//    set<vector<int>> usd;
//    auto dfs = [&] (auto&& self, vector<int> ord) {
//        if (usd.find(ord) != usd.end()) {
//            return;
//        }
//        usd.insert(ord);
////        if (ord[0] == 0 || ord[0] == n - 1) debug(ord);
//        vector<int> a(n);
//        for (int i = 0; i < n; i++) {
//            if (i < n / 2) a[i] = ord[i + n / 2];
//            else a[i] = ord[i - n / 2];
//        }
//        self(self, a);
//        for (int i = 0; i < n; i++) {
//            if (i < n / 2) a[i] = ord[i * 2];
//            else a[i] = ord[1 + (i - n / 2) * 2];
//        }
//        self(self, a);
//    };
//    vector<int> ord(n);
//    std::iota(ord.begin(), ord.end(), 0);
//    dfs(dfs, ord);
//    cout << usd.size();
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
//    cin >> t;
    while (t--) {
        solve();
    }
}
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