Submission #737264

#	Time	Username	Problem	Language	Result	Execution time	Memory
737264		minhcool	Rarest Insects (IOI22_insects)	C++17	59.61 / 100	154 ms	640 KiB

insects

#include "insects.h"
#include<bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define pb push_back
#define mp make_pair
 
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;
 
const int N = 3e5 + 5;
 
const int oo = 1e18 + 7, mod = 1e9 + 7;
 
vector<int> vc, vc2;
 
int cnt[N];
 
vector<iii> queries[13];
 
bool cmp(iii a, iii b){
	return (a.fi.fi + a.fi.se < b.fi.fi + b.fi.se);
}
 
bool in[N];
 
void moveinside(int u){
	if(in[u]) return;
	move_inside(u);
	in[u] = 1;
}
 
void moveoutside(int u){
	if(!in[u]) return;
	move_outside(u);
	in[u] = 0;
}

int p[N];

int mx[N], pref[N];
 
int min_cardinality(int n){
	for(int i = 0; i < n; i++) p[i] = i;
	shuffle(p, p + n, default_random_engine(7405));
	vc.pb(p[0]);
	moveinside(p[0]);
	for(int i = 1; i < n; i++){
		moveinside(p[i]);
		int temp = press_button();
		if(temp >= 2){
			moveoutside(p[i]);
			mx[p[i]] = vc.size();
			vc2.pb(p[i]);
		}
		else vc.pb(p[i]);
	}
	for(int i = 0; i < vc.size(); i++) cnt[i] = 1;
	for(int i = 0; i < vc2.size(); i++) queries[0].pb({{0, mx[vc2[i]] - 1}, vc2[i]});
	//for(auto it : vc) moveoutside(it);
    int lst = vc.size() - 1;
	if(vc.size() * 2 > n) return 1;
	for(int i = 0; i <= 12; i++){
		if(!queries[i].size()) break;
      	sort(queries[i].begin(), queries[i].end(), cmp);
      	for(auto it : queries[i]){
      		pref[it.fi.fi]++;
			pref[it.fi.se + 1]--;	
		}
		for(int j = 1; j < vc.size(); j++) pref[j] += pref[j - 1];
		for(int j = 0; j < vc.size(); j++) if(!pref[j]) return 1;
        if((i & 1)){
        	//cout << i << "\n";
			//for(auto it : vc) assert(!in[it]);
			for(auto it : queries[i]){
				int mid = (it.fi.fi + it.fi.se) / 2;
				if(it.fi.fi == it.fi.se){
					cnt[it.fi.fi]++;
					continue;
				}
				for(int temp = it.fi.fi; temp <= mid; temp++) moveinside(vc[temp]);
				for(int temp = mid + 1; temp <= it.fi.se; temp++) moveoutside(vc[temp]);
				/*
                while(lst > mid){
                	moveoutside(vc[lst]);
                    lst--;
                }
				while(lst < mid){
					lst++;
					moveinside(vc[lst]);
				}*/
				moveinside(it.se);
				if(press_button() >= 2) queries[i + 1].pb({{it.fi.fi, mid}, it.se});
				else queries[i + 1].pb({{mid + 1, it.fi.se}, it.se});
				moveoutside(it.se);
			}
        }
    	else{
    		//for(auto it : vc) if(!in[it]) cout << i << "\n";
    		reverse(queries[i].begin(), queries[i].end());
    		for(auto it : queries[i]){
				int mid = (it.fi.fi + it.fi.se) / 2;
				//assert(lst >= mid);
				if(it.fi.fi == it.fi.se){
					cnt[it.fi.fi]++;
					continue;
				}
				for(int temp = it.fi.fi; temp <= mid; temp++) moveinside(vc[temp]);
				for(int temp = mid + 1; temp <= it.fi.se; temp++) moveoutside(vc[temp]);
				moveinside(it.se);
				if(press_button() >= 2) queries[i + 1].pb({{it.fi.fi, mid}, it.se});
				else queries[i + 1].pb({{mid + 1, it.fi.se}, it.se});
				moveoutside(it.se);
			}
		}  
	}
	int mn = oo;
	for(int i = 0; i < vc.size(); i++) mn = min(mn, cnt[i]);
	return mn;
}

Compilation message (stderr)

insects.cpp:16:21: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   16 | const int oo = 1e18 + 7, mod = 1e9 + 7;
      |                ~~~~~^~~
insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:61:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |  for(int i = 0; i < vc.size(); i++) cnt[i] = 1;
      |                 ~~^~~~~~~~~~~
insects.cpp:62:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |  for(int i = 0; i < vc2.size(); i++) queries[0].pb({{0, mx[vc2[i]] - 1}, vc2[i]});
      |                 ~~^~~~~~~~~~~~
insects.cpp:65:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   65 |  if(vc.size() * 2 > n) return 1;
      |     ~~~~~~~~~~~~~~^~~
insects.cpp:73:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |   for(int j = 1; j < vc.size(); j++) pref[j] += pref[j - 1];
      |                  ~~^~~~~~~~~~~
insects.cpp:74:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |   for(int j = 0; j < vc.size(); j++) if(!pref[j]) return 1;
      |                  ~~^~~~~~~~~~~
insects.cpp:121:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  121 |  for(int i = 0; i < vc.size(); i++) mn = min(mn, cnt[i]);
      |                 ~~^~~~~~~~~~~
insects.cpp:64:9: warning: unused variable 'lst' [-Wunused-variable]
   64 |     int lst = vc.size() - 1;
      |         ^~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 34.61 / 75