Submission #932115

#	Time	Username	Problem	Language	Result	Execution time	Memory
932115		Darren0724	Stranded Far From Home (BOI22_island)	C++17	0 / 100	189 ms	68256 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);
int Find(int k){
    return (pa[k]==k?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];
}
int cnt1=0;
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;
    iota(all(pa),0);
    int n,m;cin>>n>>m;
    vector<int> v(N),pw(N),use(N);
    vector<int> adj[N],can(N,1),g[N],ing(N);
    vector<pair<int,int>> t;
    for(int i=1;i<=n;i++){
        cin>>v[i];pw[i]=v[i];
        t.push_back({v[i],i});
    }
    for(int i=0;i<m;i++){
        int a,b;cin>>a>>b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    sort(all(t));
    for(auto [_,i]:t){
        for(int j:adj[i]){
            if(!use[j])continue;
            int t=Find(j);
            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])ing[Find(j)]=0;
        }
        for(int j:adj[i]){
            if(use[j])onion(j,i,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;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35