oj.uz

Submission #321235

# Submission time Handle Problem Language Result Execution time Memory
321235 2020-11-11T16:02:07 Z tushar_2658 Power Plant (JOI20_power) C++14
0 / 100
 4 ms 5228 KB 
#include "bits/stdc++.h"
using namespace std;

const int maxn = 200005;

vector<int> edges[maxn];
int a[maxn], dp[maxn], ans = 0;

void dfs(int x, int p){
  int cur = a[x], res = 0;
  dp[x] = cur;
  for(auto i : edges[x]){
    if(i != p){
      dfs(i, x);
      res += dp[i];
    }
  }
  res -= cur;
  dp[x] = max(dp[x], res);
}

void dfs1(int x, int p, int carry){
  int res = carry - a[x];
  for(auto i : edges[x]){
    if(i != p){
      res += dp[i];
    }
  }
  ans = max(ans, res);
  for(auto i : edges[x]){
    if(i != p){
      dfs1(i, x, max(a[x], res - dp[i]));
    }
  }
}

int main(int argc, char const *argv[])
{
  ios::sync_with_stdio(false);
  cin.tie(0);

  int n;
  cin >> n;
  for(int i = 0; i < n - 1; ++i){
    int x, y;
    cin >> x >> y;
    edges[x].push_back(y);
    edges[y].push_back(x);
  }
  string s;
  cin >> s;
  for(int i = 1; i <= n; ++i){
    a[i] = (s[i - 1] - '0');
  }
  dfs(1, 1);
  dfs1(1, 1, 0);
  cout << ans << endl;

  return 0;
}

Subtask #1
0.0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 5228 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 41.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 5228 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 53.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 5228 KB Output isn't correct
2 Halted 0 ms 0 KB -