Submission #548089

#	Time	Username	Problem	Language	Result	Execution time	Memory
548089		Jomnoi	Secret (JOI14_secret)	C++17	100 / 100	531 ms	8312 KiB

secret

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

const int MAX_N = 1e3 + 10;

int n;
int dp[MAX_N][MAX_N];
int a[MAX_N];

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

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

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

    solve(0, (N - 1) / 2);
    solve((N - 1) / 2 + 1, N - 1);
}

int Query(int L, int R) {
    int l = 0, r = n - 1, mid = (n - 1) / 2;
    if(L == R) {
        return a[L];
    }
    while(l <= r) {
        mid = (l + r) / 2;

        if(L <= mid and mid < R) {
            return Secret(dp[L][mid], dp[mid + 1][R]);
        }
        if(mid >= R) {
            r = mid;
        }
        else {
            l = mid + 1;
        }
    }
    return -1;
}

• Subtask 1: 100 / 100