Submission #978702

#	Time	Username	Problem	Language	Result	Execution time	Memory
978702		chautanphat	Secret (JOI14_secret)	C++14	100 / 100	361 ms	4568 KiB

secret

#include "secret.h"

const int maxn = 1e3;
int mask[maxn], a[maxn];
long long ans[10][maxn];

void dnc(int l, int r, int level = 0)
{
	if (l == r) return;
	int mid = (l + r) / 2;
   	ans[level][mid] = a[mid];
    for (int i = mid - 1; i >= l; i--)
		ans[level][i] = Secret(a[i], ans[level][i + 1]);
    ans[level][mid + 1] = a[mid + 1];
    for (int i = mid + 2; i <= r; i++)
        ans[level][i] = Secret(ans[level][i - 1], a[i]);
    dnc(l, mid, level + 1);
    dnc(mid + 1, r, level + 1);
    for (int i = mid + 1; i <= r; i++) mask[i] |= 1 << level;
}

void Init(int N, int A[])
{
	for (int i = 0; i < N; i++) a[i] = A[i];
	dnc(0, N - 1);
}

int Query(int L, int R)
{
	if (L == R) return a[L];
	int level = __builtin_ctz(mask[L] ^ mask[R]);
	return Secret(ans[level][L], ans[level][R]);
}

• Subtask 1: 100 / 100