Submission #654409

#	Time	Username	Problem	Language	Result	Execution time	Memory
654409		atigun	Stranded Far From Home (BOI22_island)	C++14	0 / 100	324 ms	524288 KiB

island

#include<bits/stdc++.h>

using namespace std;
typedef long long ll;

const int maxn = 2e3;

int n, m;
vector<ll> a(maxn+5), sum(maxn+5);
vector<vector<int>> g(maxn+5);
vector<bool> work(maxn+5), vis(maxn+5);

void dfs1(int v, int p){
  vis[v] = 1, sum[v] = a[v];
  for(int u : g[v]){
    if(u == p)
      continue;
    dfs1(u, v);
    sum[v]+= sum[u];
  }
  if(p != -1)
    work[v] = (sum[v] >= a[p]);
}

void dfs2(int v, int p){
  if(p != -1)
    work[v] = min(work[v], work[p]);
  for(int u : g[v]){
    if(u == p)
      continue;
    dfs2(u, v);
  }
}

void solve(){
  cin >> n >> m;
  for(int i = 1; i <= n; i++)
    cin >> a[i];
  for(int i = 0; i < m; i++){
    int a, b;
    cin >> a >> b;
    g[a].push_back(b);
    g[b].push_back(a);
  }
  dfs1(1, -1);
  work[1] = 1;
  dfs2(1, -1);
  for(int i = 1; i <= n; i++)
    cout << work[i];
  cout << "\n";
}

int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  int tt = 1;
  // cin >> tt;
  while(tt--){
    solve();
  }
}

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