Submission #503742

#	Time	Username	Problem	Language	Result	Execution time	Memory
503742		Abrar_Al_Samit	Power Plant (JOI20_power)	C++17	0 / 100	3 ms	4940 KiB

power

#include<bits/stdc++.h>
using namespace std;
const int MX = 200005;
vector<int>g[MX];
int n;
int sub[MX];
string s;
int ans;
int DFS(int v, int p=0) {
  int cnt = 0;
  bool hierOn = false;
  for(int u : g[v]) if(u!=p) {
    int get = DFS(u, v);
    if(get!=0) {
      ++cnt;
      if(get==2) hierOn = 1;
    }
  }
  if(hierOn) {
    sub[v] = 2;
  } else if(cnt>1) {
    sub[v] = 1;
  } else {
    if(s[v]=='1') {
      ++ans;
      if(cnt>0) sub[v] = 2;
      else sub[v] = 1;
    } else {
      sub[v] = cnt!=0;
    }
  }
  return sub[v];
}
void PlayGround() {
  cin >> n;
  for(int i=1; i<n; ++i) {
    int u, v; cin >> u >> v;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  cin >> s;
  s = "#" + s;
  DFS(1);
  cout << ans << endl;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  PlayGround();
  return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 0 / 53