Submission #1157367

#	Time	Username	Problem	Language	Result	Execution time	Memory
1157367		nguyn	Secret (JOI14_secret)	C++20	100 / 100	340 ms	4516 KiB

secret

#include "secret.h"
#include <bits/stdc++.h>

using namespace std;

#define pii pair<int, int>
#define F first
#define S second

const int MAX_N = 1e3 + 5;

int n, a[MAX_N];
int pre[15][MAX_N];
int suf[15][MAX_N];

void dnc(int deg, int l, int r) {
    if (l == r) {
        suf[deg][l] = a[l];
        return;
    }
    int mid = (l + r) / 2;
    pre[deg][mid + 1] = a[mid + 1];
    for (int i = mid + 2; i <= r; i++) {
        pre[deg][i] = Secret(pre[deg][i - 1], a[i]);
    }
    suf[deg][mid] = a[mid];
    for (int i = mid - 1; i >= l; i--) {
        suf[deg][i] = Secret(a[i], suf[deg][i + 1]);
    }
    dnc(deg + 1, l, mid);
    dnc(deg + 1, mid + 1, r);
}

void Init(int N, int A[]) {
    n = N;
    for (int i = 1; i <= n; i++) {
        a[i] = A[i - 1];
    }
    dnc(1, 1, n);
}

pii get(int id, int l, int r, int u, int v) {
    int mid = (l + r) / 2;
    if (u <= mid && mid <= v) {
        return {id, mid};
    }
    if (u > mid) {
        return get(id + 1, mid + 1, r, u, v);
    }
    return get(id + 1, l, mid, u, v);
}

int Query(int L, int R) {
    int l = L + 1;
    int r = R + 1;
    if (l == r) return a[l];
    pii it = get(1, 1, n, l, r);
    int deg = it.F;
    int mid = it.S;
    if (mid == r) {
        return suf[deg][l];
    }
//    cout << deg << ' ' << mid << '\n';
    return Secret(suf[deg][l], pre[deg][r]);
}

• Subtask 1: 100 / 100