Submission #216212

#	Time	Username	Problem	Language	Result	Execution time	Memory
216212		MODDI	Cave (IOI13_cave)	C++14	0 / 100	425 ms	504 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vl vector<ll>
#define vll vector<pll>
#define vii vector<pii>
using namespace std;
 
void exploreCave(int n){
	int door[n], guess[n], status[n];
	memset(door,-1,sizeof(door));
	for(int i = 0; i < n; i++){
		int before_swap = tryCombination(status);
		int l = 0, r = n - 1;
		while(l <= r){
			bool ok = false;
			int mid = (r + l) / 2;
			for(int i = 0; i < n; i++){
				if(i >= l && i <= mid){
					if(door[i] != -1)
						guess[i] = status[i];
					else{
						guess[i] = !status[i];
						ok = true;
					}
				}
				else
					guess[i] = status[i];
			}
			int K = before_swap;
			if(ok)
				K = tryCombination(guess);
				
			if(before_swap == i){
				if(K > i || K == -1)
					r = mid;
				else
					l = mid + 1;
			}
			else{
				if(K == i)
					r = mid;
				else
					l = mid + 1;
			}
		}
		door[l] = i;
		if(before_swap == i)
			status[l] = !status[l];
	}
	answer(status,door);
}

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