Submission #368121

#	Time	Username	Problem	Language	Result	Execution time	Memory
368121		Sorting	Secret (JOI14_secret)	C++17	100 / 100	514 ms	4460 KiB

secret

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

const int N = 1000;
const int LOGN = 11;

int n, *a;
int d[LOGN][N], mask[N];

void dnc(int l, int r, int bit){
    if(l == r) return;

    int mid = (l + r) >> 1;
    d[bit][mid] = a[mid];
    for(int i = mid - 1; i >= l; --i)
        d[bit][i] = Secret(a[i], d[bit][i + 1]);

    d[bit][mid + 1] = a[mid + 1];
    for(int i = mid + 2; i <= r; ++i)
        d[bit][i] = Secret(d[bit][i - 1], a[i]);

    for(int i = mid + 1; i <= r; ++i)
        mask[i] ^= 1 << bit;

    dnc(l, mid, bit + 1), dnc(mid + 1, r, bit + 1);
}


void Init(int N, int A[]){
    n = N, a = A;
    dnc(0, n - 1, 0);
}

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

• Subtask 1: 100 / 100