Submission #1085796

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085796		f0rizen	Secret (JOI14_secret)	C++17	100 / 100	336 ms	4532 KiB

secret

#include "secret.h"

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
const int inf = 1e9 + 7;
const ll infll = 1e18;

const int lg = 10;

int *a;
vector<int> st[lg];
vector<int> mask;

void Init(int N, int A[]) {
    a = A;
    for (int i = 0; i < lg; ++i) {
        st[i].resize(N);
    }
    mask.resize(N);
    auto build = [&](auto build, int l, int r, int k) -> void {
        if (l == r) {
            return;
        }
        int mid = (l + r) / 2;
        st[k][mid] = A[mid];
        for (int i = mid - 1; i >= l; --i) {
            st[k][i] = Secret(A[i], st[k][i + 1]);
        }
        st[k][mid + 1] = A[mid + 1];
        for (int i = mid + 2; i <= r; ++i) {
            st[k][i] = Secret(st[k][i - 1], A[i]);
        }
        for (int i = mid + 1; i <= r; ++i) {
            mask[i] ^= (1 << k);
        }
        build(build, l, mid, k + 1);
        build(build, mid + 1, r, k + 1);
    };
    build(build, 0, N - 1, 0);
}

int Query(int L, int R) {
    if (L == R) {
        return a[L];
    }
    int k = __builtin_ctz(mask[L] ^ mask[R]);
    return Secret(st[k][L], st[k][R]);
}

• Subtask 1: 100 / 100