Submission #1100935

#	Time	Username	Problem	Language	Result	Execution time	Memory
1100935		doducanh	Secret (JOI14_secret)	C++14	100 / 100	313 ms	4680 KiB

secret

#include "secret.h"

#define LGN 10

unsigned y[LGN][1 << LGN];

void Init(int N, int A[])
{
    for (int s = LGN - 1, l = 1 << (LGN - 1); s >= 0; --s, l >>= 1)
        for (int i = 0; i + l < N; i += 2 * l)
        {
            int mid = i + l;
            y[s][mid] = A[mid];
            y[s][mid - 1] = A[mid - 1];
            for (int j = 1; j < l; ++j)
                y[s][mid - j - 1] = Secret(A[mid - j - 1], y[s][mid - j]);
            for (int j = 1; j < l && mid + j < N; ++j)
                y[s][mid + j] = Secret(y[s][mid + j - 1], A[mid + j]);
        }
}

int Query(int L, int R)
{
    if (L == R)
        return y[0][L];
    int i = LGN - 1, a = 0, b = 1 << LGN;
    while (i)
    {
        int mid = (a + b) / 2;
        if (R < mid)
            b = mid;
        else if (L >= mid)
            a = mid;
        else
            break;
        --i;
    }
    return Secret(y[i][L], y[i][R]);
}

• Subtask 1: 100 / 100