Submission #236214

#	Time	Username	Problem	Language	Result	Execution time	Memory
236214		VEGAnn	Dojave (COCI17_dojave)	C++14	140 / 140	804 ms	126408 KiB

dojave

#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define a3 array<int, 3>
#define MP make_pair
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
const int N = (1 << 20);
const int oo = 2e9;
unordered_map<ull, int> mem[N];
ull vl[N], ans = 0;
int m, n, a[N];

mt19937_64 rnd(chrono::system_clock().now().time_since_epoch().count());

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

#ifdef _LOCAL
    freopen("in.txt","r",stdin);
#endif // _LOCAL

    cin >> m;

    n = (1 << m);

    if (m == 1){
        cout << 2;
        return 0;
    }

    for (int i = 0; i < n; i++)
        cin >> a[i];

    for (int i = 0; i < n; i++){
        int obr = ((n - 1) ^ i);

        if (obr < i) continue;

        vl[i] = rnd();
        vl[obr] = ull(0) - vl[i];
    }

    mem[0][0]++;

    ull sum = 0;
    int xr = 0;

    for (int i = 0; i < n; i++){
        sum += vl[a[i]];
        xr ^= a[i];

        ans += mem[xr][sum];

        mem[xr][sum]++;
    }

    cout << ull(n) * (ull(n) + 1) / 2 - ans;

    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14