Submission #220416

#	Time	Username	Problem	Language	Result	Execution time	Memory
220416		2fat2code	Cave (IOI13_cave)	C++17	0 / 100	391 ms	632 KiB

cave

#include <bits/stdc++.h>
#include "cave.h"
#define ll long long
#define ld long double
#define all(a) (a).begin(), (a).end()
#define sz() size()
#define fr first
#define sc second
#define pi pair<int,int>
#define pii pair<pair<int,int>,int>
#define mp make_pair
//#define int long long
#define rc(s) return cout<<s,0
#define rcc(s) cout<<s,exit(0)
using namespace std;

const int mod=1e9+7;
const int modp=1999999973;
const int modulo=998244353;

int LAST=0;
vector<int>still_not_found;
vector<pair<int,int>>found;


void exploreCave(int N){
    ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
    srand(chrono::steady_clock::now().time_since_epoch().count());
    int ask[N];
    for(int i=0;i<N;i++) ask[i]=0;
    for(int i=0;i<N;i++) still_not_found.push_back(i);
    int curr=0;
    while(still_not_found.size()){
        curr++;
        int l=0;
        int r=still_not_found.size()-1;
        while(true){
            if(l==r){
                int Q3=tryCombination(ask);
                if(Q3==-1) Q3=(N+1);
                if(Q3<curr) ask[still_not_found[l]]^=1;
                found.push_back({still_not_found[l],ask[still_not_found[l]]});
                still_not_found.erase(still_not_found.begin()+l);
                break;
            }
            int Q1=0;
            int mid=l+(r-l)/2;
            if(LAST==0){
                Q1=tryCombination(ask);
                if(Q1==-1) Q1=(N+1);
            }
            else Q1=LAST;
            for(int i=0;i<=mid;i++){
                ask[still_not_found[i]]^=1;
            }
            int Q2=tryCombination(ask);
            if(Q2==-1) Q2=(N+1);
            if((Q1>=curr && Q2>=curr) || (Q1<curr && Q2<curr)){
                l=mid+1;
            }
            else{
                r=mid;
            }
            LAST=Q2;
        }
    }
    int ans1[N];
    for(int i=0;i<N;i++){
        ans1[i]=0;
    }
    for(int i=0;i<N;i++){
        ans1[found[i].fr]=i;
    }
    answer(ask,ans1);
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24