#include <bits/stdc++.h>
#include "mushrooms.h"
using namespace std;
#define ll long long
#define vb vector<bool>
#define pb push_back
#define ff(aa, bb, cc) for(ll aa = bb; aa < cc; aa++)
#define vl vector<ll>
#define pll pair<ll, ll>
#define fi first
#define se second
#define ed "\n"
#define all(aaa) aaa.begin(), aaa.end()
#define rall(aaa) aaa.rbegin(), aaa.rend()
ll MOD = 1000000000;
/*
static char fmt_buffer[100000];
#define FMT_TO_STR(fmt, result) va_list vargs; va_start(vargs, fmt); \
vsnprintf(fmt_buffer, sizeof(fmt_buffer), fmt, vargs); \
va_end(vargs); fmt_buffer[sizeof(fmt_buffer)-1] = 0; \
std::string result(fmt_buffer);
static const int min_n = 2;
static const int max_n = 20000;
static const int max_qc = 20000;
static const int max_qs = 100000;
static const int species_A = 0;
static const int species_B = 1;
static int n;
static std::vector<int> species;
static int qc, qs;
static inline void error_if(bool cond, std::string message) {
if (cond) {
printf("%s\n", message.c_str());
exit(0);
}
}
static inline void wrong_if(bool cond, std::string message) {
error_if(cond, "Wrong Answer: "+message);
}
int use_machine(std::vector<int> x) {
const int xs = x.size();
wrong_if(xs < 2, "Too small array for query.");
wrong_if(xs > n, "Too large array for query.");
qc++;
wrong_if(qc > max_qc, "Too many queries.");
qs += xs;
wrong_if(qs > max_qs, "Too many total array sizes as queries.");
for (int i = 0; i < xs; i++)
wrong_if(x[i] < 0 || n - 1 < x[i], "Invalid value in the query array.");
std::vector<bool> used(n, false);
for (int i = 0; i < xs; i++) {
wrong_if(used[x[i]], "Duplicate value in the query array.");
used[x[i]] = true;
}
int diffs = 0;
for (int i = 1; i < xs; i++)
diffs += int(species[x[i]] != species[x[i-1]]);
return diffs;
}
*/
/*
vector<int> abc;
vl pref;
void calc(vector<int> arr){
pref = vl(arr.size());
pref[0] = 1;
ff(i, 1, arr.size()){
pref[i] = pref[i-1];
if(arr[i] == 0){
pref[i]++;
}
}
}*/
int count_mushrooms(int nn) {
int c = 1;
if(nn == 2){
int query = use_machine({0, 1});
if(query == 0){
c++;
}
return c;
}
vector<int> z, o;
z.pb(0);
ll query1 = use_machine({0, 1}), query2 = use_machine({0, 2});
bool zero = false;
ll id = 0;
if(query1 == 0){
z.pb(1);
zero = true;
id = 1;
c++;
}
else{
o.pb(1);
}
if(query2 == 0){
z.pb(2);
id = 2;
zero = true;
c++;
}
else{
o.pb(2);
}
ll k = 75, pos = 0;
if(zero){
//cout << "HAY 2 CEROS" << ed;
for(ll i = 3; ((i/2) < k && i+1 < nn); i += 2){
int x = use_machine({i, 0, i+1, id});
if(x == 0){
z.pb(i);
z.pb(i+1);
c += 2;
}
if(x == 1){
o.pb(i);
z.pb(i+1);
c++;
}
if(x == 2){
z.pb(i);
o.pb(i+1);
c++;
}
if(x == 3){
o.pb(i);
o.pb(i+1);
}
pos = i+2;
/*cout << "I " << i << ed;
cout << pref[i+1] << " " << c << ed;
if(pref[i+1] != c){
cout << "ACA ^ ========================================================" << ed;
ff(nw, 0, i+1){
cout << pref[nw] << " ";
}
cout << ed;
}
cout << i << " " << 0 << " " << i+1 << " " << id << ed;
cout << abc[i] << " " << abc[0] << " " << abc[i+1] << " " << abc[id] << ed;
cout << ed;*/
}
if(pos != k*2+1){
if(nn % 2 == 0){
if(use_machine({0, nn-1}) == 0){
c++;
}
}
return c;
}
}
else{
//cout << "HAY 2 UNOS" << ed;
for(ll i = 3; ((i/2) < k && i+1 < nn); i += 2){
int x = use_machine({i, 1, i+1, 2});
if(x == 3){
z.pb(i);
z.pb(i+1);
c += 2;
}
else if(x != 0){
c += 1;
}
if(x == 0){
o.pb(i);
o.pb(i+1);
}
if(x == 1){
z.pb(i);
o.pb(i+1);
}
if(x == 2){
o.pb(i);
z.pb(i+1);
}
pos = i+2;
/*cout << "I " << i << ed;
cout << pref[i-1] << " " << c << ed;
if(pref[i+1] != c){
cout << "ACA ^ ========================================================" << ed;
ff(nw, 0, i+1){
cout << pref[nw] << " ";
}
cout << ed;
}
cout << i << " " << 0 << " " << i+1 << " " << id << ed;
cout << abc[i] << " " << abc[0] << " " << abc[i+1] << " " << abc[id] << ed;
cout << ed;*/
}
if(pos != k*2+1){
if(nn % 2 == 0){
if(use_machine({0, nn-1}) == 0){
c++;
}
}
return c;
}
}
//cout << "===========================================" << ed;
//cout << "POS " << pos << ed;
ll i = pos;
while(i < nn){
/*cout << "I " << i << ed;
cout << pref[i-1] << " " << c << ed;
if(pref[i-1] != c){
cout << "ACA ^ ========================================================" << ed;
}*/
vector<int> query;
ll st = i;
if(z.size() >= o.size()){ //TODOS 0s
//cout << "TODOS 0s" << ed;
ll cant = 0;
while(i < nn && cant < z.size()){
query.pb(i);
query.pb(z[cant]);
i++;
cant++;
}
/*cout << "CANTPREV " << cant << ed;
cout << "PENSADO" << ed;
ff(qqq, 0, query.size()){
if(qqq % 2 == 0){
cout << "X ";
}
else{
cout << 0 << " ";
}
}
cout << ed;
cout << "REAL" << ed;
bool ok = true;
ff(qqq, 0, query.size()){
if(qqq % 2 != 0){
if(abc[query[qqq]] != 0){
ok = false;
}
}
cout << abc[query[qqq]] << " ";
}
cout << ed;
if(ok){
cout << "OK" << ed;
}
else{
cout << "NOT OK =================================================" << ed;
}*/
ll x = use_machine(query);
//cout << "XPREV " << x << ed;
if(x % 2 == 0){
z.pb(st);
c++;
}
else{
o.pb(st);
x--;
}
cant--;
//cout << "XAFTER " << x << ed;
//cout << "CANT " << cant << ed;
if(x == 0){
c += cant;
//cout << "ES 0 " << ed;
continue;
}
c += cant-(x/2); //((cant*2)-x)/2;
//cout << cant << " - " << x << " " << "/2" << " = " << cant-(x/2) << ed;
//cout << "IEND " << i << ed;
//cout << ed;
}
else{
//cout << "TODOS 1s" << ed;
ll cant = 0;
while(i < nn && cant < o.size()){
query.pb(i);
query.pb(o[cant]);
i++;
cant++;
}
/*cout << "CANTPREV " << cant << ed;
cout << "PENSADO" << ed;
ff(qqq, 0, query.size()){
if(qqq % 2 == 0){
cout << "X ";
}
else{
cout << 1 << " ";
}
}
cout << ed;
cout << "REAL" << ed;
bool ok = true;
ff(qqq, 0, query.size()){
if(qqq % 2 != 0){
if(abc[query[qqq]] != 1){
ok = false;
}
}
cout << abc[query[qqq]] << " ";
}
cout << ed;
if(ok){
cout << "OK" << ed;
}
else{
cout << "NOT OK =================================================" << ed;
}*/
ll x = use_machine(query);
//cout << "XPREV " << x << ed;
if(x % 2 == 0){
o.pb(st);
}
else{
z.pb(st);
x--;
c++;
}
cant--;
//cout << "XAFTER " << x << ed;
//cout << "CANT " << cant << ed;
if(x == 0){
//cout << "ES 0 " << ed;
continue;
}
c += x/2;
//cout << "IEND " << i << ed;
//cout << ed;
}
}
/*if(i < n-1){
cout << "Esto no deberia pasar";
}
ff(i, 0, n){
cout << pref[i] << " ";
}
cout << ed;
cout << c << ed << ed << ed;
cout << "FIN" << ed;*/
return c;
}
/*
#ifdef __GNUC__
__attribute__ ((format(printf, 2, 3)))
#endif
static inline void check_input(bool cond, const char* message_fmt, ...) {
FMT_TO_STR(message_fmt, message);
error_if(!cond, "Invalid input: "+message);
}
int main() {
check_input(1 == scanf("%d", &n), "Could not read n.");
check_input(min_n <= n, "n must not be less than %d, but it is %d.", min_n, n);
check_input(n <= max_n, "n must not be greater than %d, but it is %d.", max_n, n);
species.resize(n);
for (int i = 0; i < n; i++) {
check_input(1 == scanf("%d", &species[i]), "Could not read species element [%d].", i);
check_input(species[i]==species_A || species[i] == species_B,
"Species elements must be %d or %d, but species element [%d] is %d.", species_A, species_B, i, species[i]);
}
check_input(species[0] == species_A, "Species element [%d] must be %d.", 0, species_A);
// Postponed closing standard input in order to allow interactive usage of the grader.
qc = 0;
qs = 0;
//calc(species);
//abc = species;
int answer = count_mushrooms(n);
printf("%d\n", answer);
//cout << "CALC " << pref[species.size()-1] << ed;
fclose(stdout);
fclose(stdin);
return 0;
}
*/
