Submission #383504

#	Time	Username	Problem	Language	Result	Execution time	Memory
383504		nicholask	Cave (IOI13_cave)	C++14	100 / 100	254 ms	1428 KiB

cave

#include <bits/stdc++.h>
#include "cave.h"
using namespace std;
void exploreCave(int N){
	int s[N],d[N];
	for (int i=0; i<N; i++){
		s[i]=0;
		d[i]=-1;
	}
	vector <int> ret;
	for (int i=0; i<N; i++){
		ret.push_back(tryCombination(s));
		int l=0,r=N-1;
		while (l<r){
			int mid=(l+r)/2;
			for (int j=l; j<=mid; j++){
				if (d[j]==-1) s[j]^=1;
			}
			bool a=(ret.back()==i);
			ret.push_back(tryCombination(s));
			bool b=(ret.back()==i);
			if (a^b) r=mid;
			else l=mid+1;
		}
		if (ret.back()==i) s[l]^=1;
		d[l]=i;
	}
	answer(s,d);
}

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