Submission #866006

#	Time	Username	Problem	Language	Result	Execution time	Memory
866006		lolismek	Secret (JOI14_secret)	C++14	100 / 100	397 ms	4488 KiB

secret

#include "secret.h"

#include <vector>
#include <iostream>

using namespace std;


const int NMAX = 2000;

int n;
int a[NMAX + 1];
int dp[20][NMAX + 1];

void divide(int level, int l, int r){
    if(l == r){
        dp[level][l] = a[l];
        return;
    }

    int mid = (l + r) / 2;
    dp[level][mid] = a[mid];

    for(int i = mid - 1; i >= l; i--){
        dp[level][i] = Secret(a[i], dp[level][i + 1]);
    }

    if(mid + 1 <= r){
        dp[level][mid + 1] = a[mid + 1];
    }
    for(int i = mid + 2; i <= r; i++){
        dp[level][i] = Secret(dp[level][i - 1], a[i]);
    }

    divide(level + 1, l, mid);
    divide(level + 1, mid + 1, r);
}

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

int getAns(int level, int l, int r, int L, int R){
    int mid = (l + r) / 2;
    if(L <= mid && mid <= R){
        if(R == mid){
            return dp[level][L];
        }
        return Secret(dp[level][L], dp[level][R]);
    }

    if(mid < L){
        return getAns(level + 1, mid + 1, r, L, R);
    }
    return getAns(level + 1, l, mid, L, R);
}
int Query(int L, int R){
    if(L == R){
        return a[L];
    }
    return getAns(1, 0, n - 1, L, R);
}

/*
5
1 2 3 4 5
1
3 4

1000
1
0 999
*/

• Subtask 1: 100 / 100