Submission #604178

#	Time	Username	Problem	Language	Result	Execution time	Memory
604178		DanerZein	Stranded Far From Home (BOI22_island)	C++14	10 / 100	1101 ms	524288 KiB

island

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> ii;
const int MAX_N=2e5+10;
vector<vi> G;
int ha[MAX_N];
bool vis[MAX_N];
int n,m;
void bfs(int u){
  for(int i=0;i<n;i++) vis[i]=0;
  priority_queue<ii, vector<ii>, greater<ii> > q;
  vis[u]=1; 
  ll co=ha[u];
  for(auto &v:G[u]){
    q.push(ii(ha[v],v));
  }
  while(!q.empty()){
    int x=q.top().second; q.pop();
    if(co<ha[x]) continue;
    vis[x]=1;
    co+=ha[x];
    for(auto &v:G[x]){
      if(!vis[v]){
        q.push(ii(ha[v],v));
      }
    }
  }
}
int pa[MAX_N];
ll sb[MAX_N];
void dfs(int u,int p){
  pa[u]=p;
  sb[u]=ha[u];
  for(auto &v:G[u]){
    if(v!=p){
      dfs(v,u);
      sb[u]+=sb[v];
    }
  }
}
int main(){
  cin>>n>>m;
  G.resize(n+1);
  for(int i=0;i<n;i++) cin>>ha[i];
  for(int i=0;i<m;i++){
    int a,b; cin>>a>>b;
    a--; b--;
    G[a].push_back(b);
    G[b].push_back(a);
  }
  string ans="1";
  dfs(0,0);
  for(int i=1;i<n;i++){
    if(sb[i]>=ha[pa[i]] && ans[pa[i]]=='1') ans+='1';
    else ans+='0';
  }
  /*for(int i=0;i<n;i++){
    bfs(i);
    bool all=1;
    for(int j=0;j<n;j++) all&=vis[j];
    if(all) ans+='1';
    else ans+='0';
    }*/
  cout<<ans<<endl;
}

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