Submission #16655

#	Time	Username	Problem	Language	Result	Execution time	Memory
16655		eaststar	Cave (IOI13_cave)	C++14	100 / 100	331 ms	612 KiB

cave

#include "cave.h"
int a[5010],b[5010],chk[5010];
void exploreCave(int n){
  int i,j,s,e,m,t,p;
  for(i=0;i<n;++i){
    t=tryCombination(a);
    s=0,e=n-1;
    while(s<e){
      m=(s+e)/2;
      for(j=s;j<=m;++j)if(!chk[j])a[j]=!a[j];
      p=t,t=tryCombination(a);
      (p==i)^(t==i)?e=m:s=m+1;
    }
    if(t==i)a[s]=!a[s];
    b[s]=i,chk[s]=1;
  }
  answer(a,b);
}

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