Submission #1162475

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1162475	2025-03-06 08:30:08	brinton	Road Closures (APIO21_roads)	C++20	0 / 100	2096 ms	21904 KiB

roads

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#include "roads.h"
#include <bits/stdc++.h>
using namespace std;
int k;
vector<vector<pair<int,int>>> edges;
pair<long long,long long> dfs(int cur,int par){
  vector<pair<long long,long long>> child;// not delete parent, delete parent
  for(auto [nxt,w]:edges[cur]){
    if(nxt == par)continue;
    auto [np,cp] = dfs(nxt,cur);
    child.push_back({np,cp+w});
  }
  long long base = 0;
  vector<long long> diff;
  for(auto [np,cp]:child){
    base += np;
    diff.push_back(cp-np);
  }
  sort(diff.begin(),diff.end());
  int out = 1+child.size();
  int del = out-k;// k must greater than 1
  pair<long long,long long> result;// not delete parent, delete parent
  long long ndelp = base,delp = base;
  // ndel parent, (all del on child)
  for(int i = 0;i < del;i++){
    ndelp += diff[i];
  }
  // not chose p, 
 
 
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