제출 #761045

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
761045		Khizri	드문 곤충 (IOI22_insects)	C++17	100 / 100	52 ms	476 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define F first
#define S second
#define INF 1e18
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pii pair<int,int>
#define pll pair<ll,ll>
#define OK cout<<"Ok"<<endl;
#define MOD (ll)(1e9+7)
#define endl "\n"
const int mxn=2e3+5;
int sz,n,cnt,color[mxn],color2[mxn];
set<int>ST;
bool check(int k){
    if(k==1) return 1;
    set<int>st;
    st=ST;
    vector<int>vt;
    for(int i=0;i<n;i++){
        vt.pb(i);
    }
    unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
    shuffle(vt.begin(),vt.end(),default_random_engine(seed));
    memset(color2,0,sizeof(color2));
    for(int id=0;id<n;id++){
        int i=vt[id];
        if(color[i]) continue;
        if(st.count(i)) continue;
        if(st.size()==cnt*k) break;
        move_inside(i);
        st.insert(i);
        if(press_button()>k){
            st.erase(i);
            color2[i]=1;
            move_outside(i);
        }
    }
    if(st.size()==cnt*k){
        ST=st;
        return 1;
    }
    else{
        for(int i=0;i<n;i++){
            if(!st.count(i)){
                color[i]=1;
            }
        }
        for(auto x:st){
            if(!ST.count(x)){
                move_outside(x);
            }
        }
        return 0;
    }
}
int min_cardinality(int N) {
    n=N;
    set<int>st;
    for(int i=0;i<n;i++){
        move_inside(i);
        cnt++;
        st.insert(i);
        if(press_button()>1){
            move_outside(i);
            st.erase(i);
            cnt--;
        }
    }
    for(auto x:st){
        move_outside(x);
    }
    if(cnt==1) return n;
    if(cnt==n) return 1;
    if(cnt>n/2) return 1;
    int l=1,r=n/cnt;
    while(l<=r){
        int m=(l+r)/2;
        if(check(m)){
            l=m+1;
        }
        else{
            r=m-1;
        }
    }
    return l-1;
}

컴파일 시 표준 에러 (stderr) 메시지

insects.cpp: In function 'bool check(int)':
insects.cpp:34:21: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   34 |         if(st.size()==cnt*k) break;
      |            ~~~~~~~~~^~~~~~~
insects.cpp:43:17: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |     if(st.size()==cnt*k){
      |        ~~~~~~~~~^~~~~~~

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