Submission #487190

#	Time	Username	Problem	Language	Result	Execution time	Memory
487190		Victor	Secret (JOI14_secret)	C++17	100 / 100	446 ms	8260 KiB

secret

#include "secret.h"

#include <bits/stdc++.h>

using namespace std;

#define rep(i, a, b) for (int i = (a); i < (b); ++i)
#define per(i, a, b) for (int i = (b - 1); i >= (a); --i)
#define trav(a, x) for (auto &a : x)

#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define pb push_back
#define debug(x) cout << #x << " = " << x << endl

#define umap unordered_map
#define uset unordered_set

typedef pair<int, int> ii;
typedef pair<int, ii> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;

typedef long long ll;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;
typedef vector<pll> vpll;

const int INF = 1'000'000'007;

int prefix[1001][1001], nums[1001];
int n;

void populate(int L, int R) {

	int mid = (L + R) / 2;

	prefix[mid][mid] = nums[mid];

	prefix[mid + 1][mid + 1] = nums[mid + 1];


	for (int i = mid + 2; i <= R; i++)

		prefix[mid + 1][i] = Secret(prefix[mid + 1][i - 1], nums[i]);

	for (int i = mid - 1; i >= L; i--)

		prefix[mid][i] = Secret(nums[i], prefix[mid][i + 1]);


	if (L < mid) populate(L, mid);

	if (mid + 1 < R) populate(mid + 1, R);

}

void Init(int N, int A[]) {
    memset(prefix, -1, sizeof(prefix));
    rep(i, 0, N) nums[i] = A[i];
    populate(0, N - 1);
    n = N;
}

int Query(int L, int R) {
    if (L == R) return nums[L];

    int lo = 0, hi = n - 1;
    while (1) {
        int mid = (lo + hi) / 2;
        if (L <= mid && mid < R) return Secret(prefix[mid][L], prefix[mid + 1][R]);
        if (R == mid) return prefix[mid][L];

        if (mid < L)
            lo = mid + 1;
        else
            hi = mid;
    }
    return 0;
}

• Subtask 1: 100 / 100