제출 #930995

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
930995		Darren0724	Stranded Far From Home (BOI22_island)	C++17	0 / 100	167 ms	60484 KiB

island

#include <bits/stdc++.h>
using namespace std;
#define int long long 
#define LCBorz ios_base::sync_with_stdio(false); cin.tie(0);
#define all(x) x.begin(), x.end()
const int N=200005;
const int INF=1e18;
const int mod=1e9+9;
vector<int> pa(N,-1);
int Find(int k){
    return (pa[k]<0?k:pa[k]=Find(pa[k]));
}
void onion(int a,int b,vector<int> &pw){
    a=Find(a),b=Find(b);
    if(a==b)return;
    pa[a]=b;
    pw[b]+=pw[a];
}
void dfs(int k,int flag,vector<int> &can,vector<int> adj[]){
    can[k]&=flag;
    for(int j:adj[k]){
        dfs(j,can[k],can,adj);
    }
}
int32_t main() {
    LCBorz;
    int n,m;cin>>n>>m;
    vector<int> v(n+1),pw(n+1),t(n),use(n+1);
    vector<int> adj[n+1],can(n+1,1),g[n+1],ing(n+1);
    for(int i=1;i<=n;i++){
        cin>>v[i];pw[i]=v[i];
    }
    for(int i=0;i<m;i++){
        int a,b;cin>>a>>b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    iota(all(t),1);
    sort(all(t),[&](int a,int b){return v[a]<v[b];});
    for(int i:t){
        for(int j:adj[i]){
            if(!use[j])continue;
            int t=Find(j);
            //cout<<i<<' '<<t<<' '<<pw[t]<<' '<<v[i]<<endl;
            if(pw[t]<v[i])can[j]=0;
            if(!ing[t]){
                ing[t]=1;
                g[i].push_back(t);
            }
        }
        for(int j:adj[i]){
            if(use[j])onion(i,j,pw);
        }
        use[i]=1;
    }
    dfs(v[n-1],1,can,g);
    for(int i=1;i<=n;i++){
        cout<<can[i];
    }
    cout<<endl;
    return 0;
}

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