Submission #672750

#	Time	Username	Problem	Language	Result	Execution time	Memory
672750		Hacv16	Cave (IOI13_cave)	C++17	100 / 100	284 ms	588 KiB

cave

#include<bits/stdc++.h>
#include "cave.h"
 
using namespace std;
 
typedef long long ll;
const int MAX = 2e6 + 15;
const int INF = 0x3f3f3f3f;

bool mark[MAX];
 
void exploreCave(int n){
	int S[n] = { 0 }, D[n] = { 0 };
 
	for(int door = 0; door < n; door++){	
		for(int i = 0; i < n; i++)
			if(!mark[i]) S[i] = 0;
 
		int color = (tryCombination(S) == door);
		int l = 0, r = n - 1;

		while(l < r){
			ll m = (l + r + 1) >> 1;

			for(int i = l; i < m; i++) if(!mark[i]) S[i] = color;
			for(int i = m; i <= r; i++) if(!mark[i]) S[i] = !color;

			int query = tryCombination(S);

			if(query == door) l = m;
			else r = m - 1;
		}
 
		mark[l] = true;
		D[l] = door;
		S[l] = color;
	}
 
	answer(S, D);
}

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