#include "cave.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> filp(int S[],bool valid[],int N,int l,int r){
vector<int> comb(N);
for(int i = 0;i < N;i++){
if(l <= i && i <= r){
if(!valid[i])comb[i] = 1 - S[i];
else comb[i] = S[i];
}else comb[i] = S[i];
}
return comb;
}
void exploreCave(int N) {
int S[N],D[N];
for(int i = 0;i < N;i++)S[i] = 0;
// for(int i = 0;i < N;i++)D[i] = 0;
bool valid[N];
for(int i = 0;i < N;i++)valid[i] = 0;
for(int i = 0;i < N;i++){
int p = tryCombination(S);
bool f = 0;
if(p == i)f = 1;
int l = 0,r = N - 1,ans = -1;
while(l < r){
int m = (l + r)/2;
vector<int> comb = filp(S,valid,N,l,m);
int Ncomb[N];
for(int j = 0;j < N;j++)Ncomb[j] = comb[j];
int s = tryCombination(Ncomb);
if(f){
if(p != i)r = m;
else l = m + 1;
}else{
if(p == i)r = m;
else l = m + 1;
}
}
D[l] = i;
if(f)S[l] = 1 - S[l];
valid[l] = 1;
}
answer(S,D);
// return;
}
