Laskettelukeskus

input/code.cpp: In function 'int haku(int)':
input/code.cpp:10:7: error: 'v' was not declared in this scope
   10 |   if (v[i].size() == 0) return values[i];
      |       ^
input/code.cpp:10:9: error: 'i' was not declared in this scope
   10 |   if (v[i].size() == 0) return values[i];
      |         ^
input/code.cpp:10:32: error: 'values' was not declared in this scope
   10 |   if (v[i].size() == 0) return values[i];
      |                                ^~~~~~
input/code.cpp:17:20: error: 'v' was not declared in this scope
   17 |   for (int child : v[i])
      |                    ^
input/code.cpp:17:22: error: 'i' was not declared in this scope
   17 |   for (int child : v[i])
      |                      ^
input/code.cpp:28:17: error: 'values' was not declared in this scope
   28 |   return max(s, values[index]);
      |                 ^~~~~~

#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int haku(int index)
{
  // If the node has no children
  if (v[i].size() == 0) return values[i];

  // The node has children
  
  // The number needed to plow the children
  int s = 0;

  for (int child : v[i])
  {
    s += haku(child);
  }

  /*
  Return the max of the number needed to
  plow the children and the number needed
  to plow the node
  */

  return max(s, values[index]);
}

int main()
{
  int n;

  cin >> n;

  vector<int> v[n];

  for (int i = 0; i < n; i++)
  {
    int a, b;

    cin >> a >> b;

    v[a-1].push_back(b-1);
  }

  int values[n];

  for (int i = 0; i < n; i++)
  {
    cin >> values[i];
  }

  cout << haku(0);
}