#include "cave.h"
#include <cstdio>
int trial_array [5010];
bool fixed_point [5010];
int switch_forward [5010]; // index is for switch
int switch_reverse [5010]; // index is for door
int switch_parity [5010]; // index is for switch; value makes it open.
int n;
// zero is for open, one means closed.
int try_wrapper(){
int tmp = tryCombination(trial_array);
if(tmp<0) tmp=2*n;
return tmp;
}
void find_switch(int l,int r,int target,int zero_result){
if(l==r){
//printf("Found door %d : switch %d\n",target,l);
switch_reverse[target]=l;
switch_forward[l]=target;
switch_parity [l]=1-zero_result;
fixed_point [l]=1;
} else {
int m=(l+r)/2;
int i;
for(i=l; i<=m; ++i) if(!fixed_point[i]) trial_array[i]=1;
/*int tmp;
printf("Trial ");
for(tmp=0; tmp<n; ++tmp) {
printf("%d",trial_array[tmp]);
if(tmp+1<n) putchar(',');
}
printf(" : ");*/
int result = try_wrapper();
//printf("%d\n",result);
for(i=l; i<=m; ++i) if(!fixed_point[i]) trial_array[i]=0;
if((result != target) == !zero_result) {
find_switch(l , m, target, zero_result);
} else {
find_switch(m+1, r, target, zero_result);
}
}
}
void exploreCave(int n) {
::n=n;
int i,j;
for(i=0;i<n;++i){
for(j=0;j<n;++j) trial_array[j]=0;
for(j=0; j<i; ++j) {
trial_array[switch_reverse[j]]=switch_parity[switch_reverse[j]];
//printf("Fixed[%d] = %d; %d opens %d\n",j,fixed_point[j],switch_reverse[j],j);
}
/*printf("zero result(");
printf("%d,%d,%d,%d",
trial_array[0],
trial_array[1],
trial_array[2],
trial_array[3]
);
printf(") : %d\n",(try_wrapper() != i));*/
find_switch(0,n-1, i,(try_wrapper() != i));
}
answer(switch_parity, switch_forward);
}
