Submission #672744

#	Time	Username	Problem	Language	Result	Execution time	Memory
672744		Hacv16	Cave (IOI13_cave)	C++17	0 / 100	73 ms	404 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;

int n, S[MAX], D[MAX];
bool mark[MAX];

bool f(int l, int r, int m, int j, int c){
	for(int i = l; i < m; i++) if(!mark[i]) S[i] = c;
	for(int i = m; i <= r; i++) if(!mark[i]) S[i] = !c;

	int query = tryCombination(S);
	return (query != j);
}

void exploreCave(int n_){
	n = n_;

	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, pos = -1;

		while(l <= r){
			int m = (l + r) >> 1;
			if(f(l, r, m, door, color)) r = m - 1, pos = m;
			else l = m + 1;
		}

		mark[pos] = true;
		D[pos] = door;
		S[pos] = color;
	}

	answer(S, D);
}

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