Submission #1219638

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219638		vanea	Secret (JOI14_secret)	C++20	0 / 100	389 ms	4452 KiB

secret

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

const int mxN = 1e3+10;

int dat[12][mxN], mask[mxN];
vector<int> x;

void divi(int l, int r, int lvl) {
    if(l == r) return ;
    int m = (l+r)/2;
    dat[lvl][m] = x[m];
    for(int i = m-1; i >= l; i--) dat[lvl][i] = Secret(x[i], dat[lvl][i+1]);
    dat[lvl][m+1] = x[m+1];
    for(int i = m+2; i <= r; i++) dat[lvl][i] = Secret(x[i], dat[lvl][i-1]);
    for(int i = m+1; i <= r; i++) mask[i] ^= (1 << lvl);
    divi(l, m, lvl+1); divi(m+1, r, lvl+1);
}

void Init(int n, int a[]) {
    for(int i = 0; i < n; i++) {
        int it = a[i];
        x.push_back(it);
    }
    divi(0, n-1, 0);
}

int Query(int l, int r) {
    if(l == r) return x[l];
    int bits = __builtin_ctz(mask[l] ^ mask[r]);
    return Secret(dat[bits][l], dat[bits][r]);
}

• Subtask 1: 0 / 100