Submission #1100950

#	Time	Username	Problem	Language	Result	Execution time	Memory
1100950		doducanh	Secret (JOI14_secret)	C++14	100 / 100	342 ms	8268 KiB

secret

///breaker
#include "secret.h"
#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define ii pair<int,int>
#define mp make_pair
#define in(x) freopen(x,"r",stdin)
#define out(x) freopen(x,"w",stdout)
#define bit(x,i) ((x>>i)&1)
#define lc (id<<1)
#define rc ((id<<1)^1)
const int maxn=1005;
int pre[maxn][maxn];
int a[maxn];
int n;
void dac(int l,int r)
{
    int m=(l+r)/2;
    pre[m][m]=a[m];
    pre[m+1][m+1]=a[m+1];
    for(int i=m+2;i<=r;i++){
        pre[m+1][i]=Secret(pre[m+1][i-1],a[i]);
    }
    for(int i=m-1;i>=l;i--){
        pre[m][i]=Secret(a[i],pre[m][i+1]);
    }

    if(l<m)dac(l,m);
    if(m+1<r)dac(m+1,r);
}
void Init(int N,int A[])
{
    n=N;
    for(int i=0;i<n;i++){
        a[i]=A[i];
    }
    dac(0,n-1);
}
int Query(int l,int r)
{
    int lo=0,hi=n-1;
    while(lo!=hi){
        int m=(lo+hi)/2;
        if(m>=l&&m<r){
            return Secret(pre[m][l],pre[m+1][r]);
        }
        else if(m==r){
            return pre[m][l];
        }
        else if(m<l){
            lo=m+1;
        }
        else hi=m;
    }
    return pre[lo][lo];
}
/* stuff you should look for
 * int overflow, array bounds
 * special cases (n=1?)
 * do smth instead of nothing and stay organized
 * WRITE STUFF DOWN
 * DON'T GET STUCK ON ONE APPROACH
 */

• Subtask 1: 100 / 100