Submission #321402

#	Time	Username	Problem	Language	Result	Execution time	Memory
321402		shaf_wa_nur	Power Plant (JOI20_power)	C++14	100 / 100	194 ms	34400 KiB

power

/**
 *    author:  shafwanur010
 *    created: 11/11/2020 10:23:47 PM (Bangladesh Standard Time)
**/
#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
  #include "debug.h"
#else
  #define debug(...) 42
#endif

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<vector<int>> g(n + 1);
  for (int i = 0; i < n - 1; i++) {
    int u, v;
    cin >> u >> v;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  string s;
  cin >> s;
  s = '0' + s;
  int ans = 0;
  vector<int> dp(n + 1);
  function<void(int, int)> dfs = [&](int u, int p) {
    int sum = 0;
    for (int v : g[u]) {
      if (v != p) {
        dfs(v, u);
        sum += dp[v];
      }
    }
    dp[u] = max(s[u] - '0', sum - (s[u] - '0'));
    ans = max({ans, dp[u], dp[u] + (s[p] - '0')});
  };
  dfs(1, 0);
  cout << ans << '\n';
}

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