제출 #803727

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
803727		8pete8	비밀 (JOI14_secret)	C++14	0 / 100	393 ms	4488 KiB

secret

#include<bits/stdc++.h>
#include "secret.h"
using namespace std;
#define ll long long
#define f first
#define endl "\n"
#define s second
#define pii pair<int,int>
#define ppii pair<int,pii>
#define pb push_back
#define fastio ios::sync_with_stdio(false);cin.tie(NULL);
using namespace std;
const int mxn=1e3;
int ans[11][mxn+10];
int v[mxn+10],in[mxn+10];
void solve(int l,int r,int lev){
    if(l==r)return;
    int m=l+(r-l)/2;
    ans[lev][m]=v[m];
    for(int i=m-1;i>=l;i--)ans[lev][i]=Secret(v[i],ans[lev][i+1]);
    ans[lev][m+1]=v[m+1];
    for(int i=m+2;i<=r;i++)ans[lev][i]=Secret(v[i],ans[lev][i-1]);
    for(int i=m+1;i<=r;i++)in[i]^=(1<<lev);
    solve(l,m,lev+1);
    solve(m+1,r,lev+1);
}
void Init(int N,int A[]){
    for(int i=0;i<N;i++)v[i]=A[i];
    solve(0,N-1,0);
}
int Query(int L,int R){
    if(L==R)return v[L];
    int b=__builtin_ctz(in[L]^in[R]);
    return Secret(ans[b][L],ans[b][R]);
}

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