Submission #720212

#	Time	Username	Problem	Language	Result	Execution time	Memory
720212		Yell0	Cave (IOI13_cave)	C++17	100 / 100	682 ms	588 KiB

cave

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

void exploreCave(int N) {
  int config[N],perm[N];
  vector<int> idx;
  for(int i=0;i<N;++i) idx.push_back(i);
  for(int i=0;i<N;++i) {
    int on=1;
    for(int x:idx) config[x]=1;
    if(tryCombination(config)==i) on=0;
    for(int x:idx) config[x]=!on;
    int lo=0,hi=N-i-1;
    while(lo<=hi) {
      int mid=(lo+hi)/2,j=0;
      for(int x:idx) {
        if(j>mid) break;
        if(j++<lo) continue;
        config[x]=on;
      }
      if(tryCombination(config)==i) lo=mid+1;
      else hi=mid-1;
      for(int x:idx) config[x]=!on;
    }
    config[idx[lo]]=on;
    perm[idx[lo]]=i;
    idx.erase(idx.begin()+lo);
  }
  answer(config,perm);
}

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