Submission #647806

#	Time	Username	Problem	Language	Result	Execution time	Memory
647806		clams	Secret (JOI14_secret)	C++17	100 / 100	455 ms	4452 KiB

secret

#include "secret.h"
#include <bits/stdc++.h>
using namespace std;

const int N = 1e3 + 5;
const int LG = __lg(N) + 1;
const int LIM = 8000;

int n;
int a[N];
int dat[LG][N];
int msk[N];

void Rec(int l, int r, int lvl) {
    if (l == r) return;

    int m = (l + r) / 2;

    dat[lvl][m] = a[m];
    for (int i = m - 1; i >= l; i--) {
        dat[lvl][i] = Secret(a[i], dat[lvl][i + 1]); // notice the order
    }

    dat[lvl][m + 1] = a[m + 1];
    for (int i = m + 2; i <= r; i++) {
        dat[lvl][i] = Secret(dat[lvl][i - 1], a[i]);
    }

    for (int i = m + 1; i <= r; i++) {
        msk[i] |= (1 << lvl);
    }

    Rec(l, m, lvl + 1);
    Rec(m + 1, r, lvl + 1);
}

int Query(int l, int r) {
    if (l == r) return a[l];
    int lvl = __builtin_ctz(msk[l] ^ msk[r]);
    return Secret(dat[lvl][l], dat[lvl][r]);
}

void Init(int sz, int A[]) {
    copy(A, A + sz, a);
    n = sz;

    Rec(0, n - 1, 0);
}

• Subtask 1: 100 / 100