Submission #657725

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
6577252022-11-10 20:39:38bebraDojave (COCI17_dojave)C++17
126 / 140
721 ms56620 KiB
#include <bits/stdc++.h>
using namespace std;
#define dbg(x) cerr << #x << ": " << x << endl;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int m;
cin >> m;
int n = 1 << m;
int max_mask = n - 1;
vector<int> s(n);
vector<uint64_t> xor_hash(n);
mt19937_64 rng(1233);
for (int i = 0; i < n; ++i) {
int x;
cin >> x;
if (x & (1 << (m - 1))) x ^= max_mask;
s[i] = x;
xor_hash[i] = rng();
}
long long ans = 1LL * n * (n + 1) / 2 - (n == 1);
vector<unordered_map<uint64_t, int>> pos(4);
++pos[3][0];
uint64_t pref = 0;
for (int i = 0; i < n; ++i) {
pref ^= xor_hash[s[i]];
ans -= pos[i % 4][pref];
 
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