Submission #135637

#	Time	Username	Problem	Language	Result	Execution time	Memory
135637		mirbek01	Cave (IOI13_cave)	C++11	100 / 100	731 ms	684 KiB

cave

#include "cave.h"
//#include "grader.cpp"
#include <bits/stdc++.h>

using namespace std;

const int MAXN = 5e3 + 2;

int f[MAXN], s[MAXN], ar[MAXN], pos[MAXN], used[MAXN]; 

void exploreCave(int N) {
	for(int i = 0; i < N; i ++){
		for(int j = 0; j < N; j ++)
			ar[j] = 0;
		for(int j = 0; j < i; j ++){
			ar[ pos[j] ] = f[ pos[j] ];
		}
		int ret = tryCombination(ar);
		vector <int> v;
		for(int j = 0; j < N; j ++){
			if(!used[j])
				v.push_back(j);
		}
		int correct = 0;
		if(ret == i)
			correct = 1;
		int lo = 0, hi = (int)v.size() - 1;
		while(lo <= hi){
			int md = (lo + hi) >> 1;
			if(!correct){
				for(int j = md + 1; j < (int)v.size(); j ++)
					ar[ v[j] ] = 0;
				for(int j = 0; j <= md; j ++)
					ar[ v[j] ] = 1;
			} else {
				for(int j = md + 1; j < (int)v.size(); j ++)
					ar[ v[j] ] = 1;
				for(int j = 0; j <= md; j ++)
					ar[ v[j] ] = 0;
			}
			ret = tryCombination(ar);
			if(ret == i){
				hi = md - 1;
			} else {
				lo = md + 1;
			}
		}
		lo = v[hi + 1]; 
		f[lo] = correct;
		s[lo] = i; 
		used[lo] = 1;
		pos[i] = lo;
	}
	
	answer(f, s);
}

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