# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
629122 | urd05 | Rarest Insects (IOI22_insects) | C++17 | 1 ms | 336 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> v;
bool in[2000];
bool vis[2000];
int mnv;
int val;
int n;
int mi(int i) {
in[i]=true;
move_inside(v[i]);
}
int mo(int i) {
in[i]=false;
move_outside(v[i]);
}
int pb() {
return press_button();
}
void clean() {
for(int i=0;i<n;i++) {
if (in[i]) {
mo(i);
}
}
}
int f() {
int pr=0;
int ret=0;
for(int i=0;i<n;i++) {
mi(i);
int got=pb();
if (got==pr) {
mo(i);
}
else {
//vis[i]=true;
ret++;
pr=got;
}
}
clean();
return ret;
}
bool isp(int x) {
x-=mnv;
vector<int> in;
vector<int> out;
for(int i=0;i<n;i++) {
if (vis[i]) {
continue;
}
mi(i);
int got=pb();
if (got>x) {
mo(i);
out.push_back(i);
}
else {
in.push_back(i);
}
}
clean();
if (in.size()==x*val) {
for(int i=0;i<in.size();i++) {
vis[in[i]]=true;
}
mnv+=x;
return true;
}
for(int i=0;i<out.size();i++) {
vis[out[i]]=true;
}
return false;
}
int min_cardinality(int N) {
n=N;
for(int i=0;i<n;i++) {
v.push_back(i);
}
srand(int(time(NULL)));
random_shuffle(v.begin(),v.end());
val=f();
if (val<4) {
memset(vis,0,sizeof(vis));
int sum=n;
int ret=n;
for(int i=0;i<val-1;i++) {
int now=0;
while (vis[now]) {
now++;
}
mi(now);
vis[now]=true;
now++;
int cnt=1;
while (now<n) {
while (now<n&&vis[now]) {
now++;
}
if (now>=n) {
break;
}
mi(now);
int got=pb();
if (got>=2) {
mo(now);
}
else {
vis[now]=true;
cnt++;
}
}
clean();
ret=min(ret,cnt);
sum-=cnt;
}
return min(sum,ret);
}
int lo=1; //ans>=lo
int hi=n/val+1; //ans<hi
while (lo+1<hi) {
int mid=(lo+hi)/2;
if (isp(mid)) {
lo=mid;
}
else {
hi=mid;
}
}
return lo;
}
Compilation message (stderr)
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