Submission #95288

#	Time	Username	Problem	Language	Result	Execution time	Memory
95288		dalgerok	Secret (JOI14_secret)	C++14	100 / 100	507 ms	9504 KiB

secret

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



const int N = 1005;


int n, a[N], dp[N][N];
bool used[N][N];

void rec(int l, int r){
    if(l == r){
        return;
    }
    if(l + 1 == r){
        return;
    }
    int mid = (r + l) >> 1;
    dp[mid][mid] = a[mid];
    dp[mid + 1][mid + 1] = a[mid + 1];
    for(int i = mid + 2; i <= r; i++){
        if(!used[mid + 1][i]){
            used[mid + 1][i] = true;
            dp[mid + 1][i] = Secret(dp[mid + 1][i - 1], a[i]);
        }
    }
    for(int i = mid - 1; i >= l; i--){
        if(!used[i][mid]){
            used[i][mid] = true;
            dp[i][mid] = Secret(a[i], dp[i + 1][mid]);
        }
    }
    rec(l, mid);
    rec(mid + 1, r);
}

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

int Query(int L, int R){
    if(L == R){
        return a[L];
    }
    if(L + 1 == R){
        return Secret(a[L], a[R]);
    }
    int l = 0, r = n - 1;
    while(r - l > 1){
        int mid = (r + l) >> 1;
        if(L <= mid && mid + 1 <= R){
            return Secret(dp[L][mid], dp[mid + 1][R]);
        }
        if(R <= mid){
            r = mid;
        }
        else{
            l = mid + 1;
        }
    }
}

Compilation message (stderr)

secret.cpp: In function 'int Query(int, int)':
secret.cpp:67:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 100 / 100