Submission #1069475

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069475		Requiem	Secret (JOI14_secret)	C++17	100 / 100	314 ms	4436 KiB

secret

#include "secret.h"

#include<bits/stdc++.h>
#define ll long long
#define FOR(i, a, b) for(int i = a; i <= b;i++)
#define FORD(i, a, b) for(int i = a; i >= b; i--)
#define TASKNAME "secret"
using namespace std;

const int MAXN = 1004;
int P[20][MAXN], mask[MAXN], a[MAXN];
int n, q;

void DnC(int l, int r, int lev){
    if (l == r){
        return;
    }
    int mid = (l + r) >> 1;
    P[lev][mid] = a[mid];
    P[lev][mid + 1] = a[mid + 1];
//    printf("RANGE %lld %lld\n", l, r);
    FORD(i, mid - 1, l){
         P[lev][i] = Secret(a[i], P[lev][i + 1]);
    }
//    FORD(i, mid, l){
//         printf("%lld ", P[lev][i]);
//    }
//    printf("\n");

    FOR(i, mid + 2, r){
         P[lev][i] = Secret(P[lev][i - 1], a[i]);
    }
//    FOR(i, mid + 1, r){
//        printf("%lld ", P[lev][i]);
//    }
//    printf("\n");

    FOR(i, mid + 1, r) mask[i] ^= (1LL << lev);
    DnC(l, mid, lev + 1);
    DnC(mid + 1, r, lev + 1);
}
void Init(int N, int A[]) {
    FOR(i, 0, N - 1){
        a[i] = A[i];
    }
    DnC(0, N - 1, 0);
}

int Query(int L, int R) {

  if (L == R) return a[L];
  else{
     int bit = __builtin_ctz(mask[L] ^ mask[R]);
//     printf("%lld %lld %lld\n", bit, P[bit][L], P[bit][R]);
     return Secret(P[bit][L], P[bit][R]);
  }
  return 0;
}

• Subtask 1: 100 / 100