Submission #1013347

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013347		AverageAmogusEnjoyer	Secret (JOI14_secret)	C++17	100 / 100	318 ms	4436 KiB

secret

#include <bits/stdc++.h>
#include "secret.h"
using namespace std;
using ll = long long;
template<class T> bool cmin(T &i, T j) { return i > j ? i=j,true:false; }
template<class T> bool cmax(T &i, T j) { return i < j ? i=j,true:false; }

mt19937 mrand(chrono::steady_clock::now().time_since_epoch().count());

int rng() {
    return abs((int)mrand());
}

// Current challenge: finish CSES problemset!!

constexpr int nax = 1000, lg = 10;

int res[lg][nax];

int mask[nax];

int a[nax];

void build(int l,int r,int pw) {
    if (l == r) {
        return;
    }
    int m = (l+r)/2;
    res[pw][m] = a[m];
    for (int i=m-1;i>=l;i--) { res[pw][i] = Secret(a[i],res[pw][i+1]); }
    res[pw][m+1] = a[m+1];
    for (int i=m+2;i<=r;i++) { res[pw][i] = Secret(res[pw][i-1],a[i]); } 
    for (int i=m+1;i<=r;i++) { mask[i] ^= 1 << pw; }
    build(l,m,pw+1);
    build(m+1,r,pw+1);
}

void Init(int n,int _a[]) {
    for (int i=0;i<n;i++) {
        a[i] = _a[i];
    }
    build(0,n-1,0);
}

int Query(int l,int r) {
    if (l == r) { return a[l]; }
    int bits = __builtin_ctz(mask[l] ^ mask[r]);
    return Secret(res[bits][l],res[bits][r]);
}

• Subtask 1: 100 / 100