Submission #774488

#	Time	Username	Problem	Language	Result	Execution time	Memory
774488		colossal_pepe	Secret (JOI14_secret)	C++17	100 / 100	365 ms	12328 KiB

secret

#include "secret.h"
#include <vector>
using namespace std;

int n;
vector<vector<int>> tree(4005);

void buildTree(int node, int l, int r, int a[]) {
    tree[node].resize(n);
    if (node % 2) {
        tree[node][l] = a[l];
        for (int i = l + 1; i <= r; i++) {
            tree[node][i] = Secret(tree[node][i - 1], a[i]);
        }
    } else {
        tree[node][r] = a[r];
        for (int i = r - 1; i >= l; i--) {
            tree[node][i] = Secret(a[i], tree[node][i + 1]);
        }
    }
    if (l != r) {
        int mid = (l + r) / 2;
        buildTree(2 * node, l, mid, a);
        buildTree(2 * node + 1, mid + 1, r, a);
    }
}

int query(int node, int l, int r, int L, int R) {
    if (l == r) return tree[node][l];
    int mid = (l + r) / 2;
    if (R <= mid) return query(2 * node, l, mid, L, R);
    else if (L > mid) return query(2 * node + 1, mid + 1, r, L, R);
    else return Secret(tree[2 * node][L], tree[2 * node + 1][R]);
}

void Init(int N, int A[]) {
    n = N;
    buildTree(2, 0, (n - 1) / 2, A);
    buildTree(3, ((n - 1) / 2) + 1, n - 1, A);
}

int Query(int L, int R) {
    return query(1, 0, n - 1, L, R);
}

• Subtask 1: 100 / 100