Submission #282325

#	Time	Username	Problem	Language	Result	Execution time	Memory
282325		themax23	Cave (IOI13_cave)	C++17	0 / 100	30 ms	484 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>
using namespace std;

int N;
bool check_state(int* test, int idx){
	int first = tryCombination(test);
	if(first == -1) return false;
	if(first >= idx) return false;
	return true;
}

bool can(int lo, int mid, int hi, char side, bool state, int idx){
	int test[N] = {0};
	if(side == 'L'){
		for(int i = lo; i < mid; ++i)
			test[i] = 1;
	}
	else{
		for(int i = mid; i <= hi; ++i)
			test[i] = 1;
	}
	bool new_state = check_state(test,idx);
	if (state != new_state) return true;
	return false;
}

int bs(bool state, int idx, char side){
	int hi = N-1, lo = 0, mid = lo + (hi - lo) / 2, ans = -1;
	while(hi <= lo){
		if (can(lo, mid, hi, side, state, idx)) 
			{ans = mid; mid = hi - 1; side = 'L';}
		else 
			{mid = lo + 1; side = 'R';}
	}
	return ans;
}


void exploreCave(int n) {
	N = n;
	int S[N] = {0}, D[N] = {0};
	for(int i = 0; i < N; ++i){
		bool state = check_state(S,i); // 0 = open, 1 = closed
		char side = 'L';
		if(state) S[i] = 1;
		D[i] = bs(state,i,side);
	}
	answer(S,D);
}

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