Submission #383885

#	Time	Username	Problem	Language	Result	Execution time	Memory
383885		JerryLiu06	Secret (JOI14_secret)	C++11	100 / 100	536 ms	4460 KiB

secret

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

using namespace std;

int dat[10][1010], mask[1010], A[1010];

void divide(int L, int R, int lev, int A[]) {
    if (L == R) return ; int mid = (L + R) / 2;

    dat[lev][mid] = A[mid]; for (int i = mid - 1; i >= L; i--) dat[lev][i] = Secret(A[i], dat[lev][i + 1]);
    dat[lev][mid + 1] = A[mid + 1]; for (int i = mid + 2; i <= R; i++) dat[lev][i] = Secret(dat[lev][i - 1], A[i]);

    for (int i = mid + 1; i <= R; i++) mask[i] ^= (1 << lev);

    divide(L, mid, lev + 1, A); divide(mid + 1, R, lev + 1, A);
}
void Init(int N, int arr[]) { for (int i = 0; i < N; i++) A[i] = arr[i]; divide(0, N - 1, 0, A); }

int Query(int L, int R) { if (L == R) return A[L];
    int lev = __builtin_ctz(mask[L] ^ mask[R]); return Secret(dat[lev][L], dat[lev][R]);
}

Compilation message (stderr)

secret.cpp: In function 'void divide(int, int, int, int*)':
secret.cpp:9:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    9 |     if (L == R) return ; int mid = (L + R) / 2;
      |     ^~
secret.cpp:9:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    9 |     if (L == R) return ; int mid = (L + R) / 2;
      |                          ^~~

• Subtask 1: 100 / 100