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Submission #657723

# Submission time Handle Problem Language Result Execution time Memory
657723 2022-11-10T20:26:52 Z bebra Dojave (COCI17_dojave) C++17
126 / 140
 709 ms 56640 KB 
#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;
    const 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;
    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];
        ++pos[i % 4][pref];
    }
    cout << ans << '\n';
    return 0;
}

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 212 KB Output is correct

Subtask #3
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 468 KB Output is correct
2 Correct 2 ms 724 KB Output is correct

Subtask #5
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 1108 KB Output is correct
2 Correct 5 ms 920 KB Output is correct
3 Correct 4 ms 852 KB Output is correct

Subtask #6
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 3816 KB Output is correct
2 Correct 19 ms 3032 KB Output is correct
3 Correct 32 ms 5744 KB Output is correct

Subtask #7
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 3736 KB Output is correct
2 Correct 36 ms 5888 KB Output is correct
3 Correct 86 ms 13188 KB Output is correct

Subtask #8
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 128 ms 14256 KB Output is correct
2 Correct 95 ms 11548 KB Output is correct
3 Correct 71 ms 11692 KB Output is correct

Subtask #9
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 709 ms 56560 KB Output is correct
2 Correct 631 ms 56640 KB Output is correct
3 Correct 343 ms 34500 KB Output is correct

Subtask #10
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 669 ms 56456 KB Output is correct
2 Correct 468 ms 45368 KB Output is correct
3 Correct 543 ms 48508 KB Output is correct
4 Correct 662 ms 56372 KB Output is correct