제출 #985672

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
985672		tfgs	비밀 (JOI14_secret)	C++17	0 / 100	393 ms	4588 KiB

secret

#include "secret.h"
#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
#include "algo/debug.h"
#endif

#define f first
#define s second
template<class T> using V = vector<T>; 
using vi = V<int>;
using vb = V<bool>;
using vs = V<string>;

#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x) 
#define pb push_back
#define lb lower_bound
#define ub upper_bound
template<class T> int lwb(V<T>& a, const T& b) { return lb(all(a),b)-bg(a); }
template<class T> int upb(V<T>& a, const T& b) { return ub(all(a),b)-bg(a); }

const int max_n = 1000, max_bit = 9;
int dat[max_bit][max_n];
int mask[max_n];
int n, a[max_n];
void precalc(int l, int r, int lvl) {
    if (l == r-1) return;
    int m = (l+r)/2;
    dat[lvl][m-1] = a[m-1];
    for (int i = m-2; i >= l; i--) dat[lvl][i] = Secret(dat[lvl][i+1], a[i]);
    dat[lvl][m] = a[m];
    for (int i = m+1; i < r; i++) dat[lvl][i] = Secret(dat[lvl][i-1], a[i]);
    for (int i = m; i < r; i++) mask[i] |= 1<<lvl;
    precalc(l, m, lvl+1);
    precalc(m, r, lvl+1);
}

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

int Query(int L, int R) {
    R++;
    if (L == R-1) return a[L];
    int tz = __builtin_ctz(mask[L]^mask[R]);
    return Secret(dat[tz][L], dat[tz][R]);
}

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