Submission #494429

#	Time	Username	Problem	Language	Result	Execution time	Memory
494429		Khizri	Keys (IOI21_keys)	C++17	20 / 100	3080 ms	20872 KiB

keys

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define pb push_back
#define F first
#define S second
const int mxn=2000+5;
int n,m;
vector<pii>vt[mxn];
int bfs(int u,vector<int> &r){
    vector<int>v1;
    vector<int>color(mxn);
    vector<int>mp(mxn);
    color[u]=1;
    bool q=true;
    v1.pb(u);
    mp[r[u]]=1;
    while(q){
        q=false;
        for(int x:v1){
            for(pii p:vt[x]){
                int v=p.F,k=p.S;
                if(color[v]) continue;
                if(mp[k]){
                    mp[r[v]]=1;
                    v1.pb(v);
                    color[v]=1;
                    q=true;
                    goto loop;
                }
            }
        }
        loop:;
    }
    return (int)v1.size();
}
vector<int> find_reachable(vector<int> r,vector<int> u,vector<int> v,vector<int> c) {
    n=r.size();
    m=u.size();
	for(int i=0;i<m;i++){
        vt[u[i]].pb({v[i],c[i]});
        vt[v[i]].pb({u[i],c[i]});
	}
	int cnt=1e7;
	vector<int>ans;
    for(int i=0;i<n;i++){
        int x=bfs(i,r);
        cnt=min(x,cnt);
        ans.pb(x);
    }
    for(int i=0;i<n;i++){
        if(ans[i]==cnt){
            ans[i]=1;
        }
        else{
            ans[i]=0;
        }
    }
    return ans;
}

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 0 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33