Submission #672084

#	Time	Username	Problem	Language	Result	Execution time	Memory
672084		tbzard	Rarest Insects (IOI22_insects)	C++17	0 / 100	30 ms	4760 KiB

insects

#include <bits/stdc++.h>
using namespace std;
void move_inside(int i);
void move_outside(int i);
int press_button();

int p[2222], sz[2222];
bool asked[2222][2222];
int root(int a){
    return p[a] == a?a:(p[a]=root(p[a]));
}
void merge(int a, int b, int n){
    a = root(a), b = root(b);
    if(a != b){
        p[a] = b;
        sz[b] += sz[a];
        for(int i=1;i<=n;i++){
            asked[b][i] |= asked[a][i];
            asked[i][b] |= asked[i][a];
        }
    }
}
int min_cardinality(int n){
    for(int i=1;i<=n;i++) p[i] = i, sz[i] = 1;
    for(int i=1;i<=n;i++) asked[i][i] = 1;
    set<int> cur;
    for(int i=1;i<=n;i++) cur.insert(i);

    int ans = 1e9;
    while(!cur.empty()){
        int u = *cur.begin();
        cur.erase(cur.begin());

        move_inside(u-1);
        int cnt = 1, rem = 0;
        for(int i=1;i<=n;i++){
            int ru = root(u), rv = root(i);
            if(asked[ru][rv]) continue;
            rem++;
        }
        for(int i=1;i<=n;i++){
            int ru = root(u), rv = root(i);
            if(asked[ru][rv]) continue;

            if(cnt + rem >= ans) break;

            move_inside(i-1);
            int r = press_button();
            if(r == 2){
                asked[ru][rv] = 1;
                asked[rv][ru] = 1;
                merge(u, i, n);
                cnt++;
                cur.erase(cur.find(i));
            }
            else{
                asked[ru][rv] = 1;
                asked[rv][ru] = 1;
            }
            move_outside(i-1);
            rem--;
        }
        move_outside(u-1);
        ans = min(ans, cnt);
    }
    return ans;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75