Submission #532506

#	Time	Username	Problem	Language	Result	Execution time	Memory
532506		Evang	Secret (JOI14_secret)	C++17	100 / 100	447 ms	4524 KiB

secret

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

static const int N = 1005;
static int n, a[N];
vector<int> lef[N], rig[N];

void evan(int l, int r){
    if(l==r)
        return;
    int m = (l+r)/2;

    lef[m].pb(a[m]);
    for(int i = m-1; i >= l; --i)
        lef[m].pb(Secret(a[i], lef[m].back()));
    rig[m+1].pb(a[m+1]);
    for(int i = m+2; i <= r; ++i)
        rig[m+1].pb(Secret(rig[m+1].back(), a[i]));

    evan(l, m);
    evan(m+1, r);
}

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

int Query(int l, int r) {
    int il = 0, ir = n-1;
    while(il<ir){
        int m = (il+ir)/2;
        if(l<=m && m < r)
            return Secret(lef[m][m-l], rig[m+1][r-m-1]);
        if(m < l)
            il = m+1;
        else
            ir = m;
    }
    return a[r];
}

• Subtask 1: 100 / 100