Submission #894694

#	Time	Username	Problem	Language	Result	Execution time	Memory
894694		Hugo1729	Cave (IOI13_cave)	C++11	100 / 100	455 ms	612 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>

using namespace std;
int n;
vector<int> on{}, off{};

int query(int a, int b,int cor){
    int ans[n];
    
    if(cor){
        fill(ans,ans+n,0);
        for(int i=a;i<=b;i++) ans[i]++;
    }else{
        fill(ans,ans+n,1);
        for(int i=a;i<=b;i++) ans[i]--;
    }

    for(int p : off) ans[p]=0;
    for(int p : on) ans[p]=1;

    int ret = tryCombination(ans);

    return ret;
}

void exploreCave(int N) {
    n=N;
    int D[N],S[N];

    for(int p=0;p<N;p++){
        int lo=0,hi=n-1,cor=1;

        if(query(lo,hi,cor)==p) cor--;

        while(lo!=hi){
            int mid=(lo+hi)/2;
            int q=query(lo,mid,cor);

            // cout << '(' << lo << hi << cor << q << ')';
            

            if(q==p) lo=mid+1;
            else hi = mid;
        }

        S[lo] = cor;
        D[lo] = p;

        if(cor) on.push_back(lo);
        else off.push_back(lo);
    }

    // // int a; cin >> a;
    // cout << tryCombination(sus);

    answer(S,D);
    return;
}

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