제출 #573205

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
573205		600Mihnea	도로 폐쇄 (APIO21_roads)	C++17	14 / 100	2096 ms	23432 KiB

roads

#include <bits/stdc++.h>
#include "roads.h"


using namespace std;

typedef long long ll;

vector<ll> minimum_closure_costs(int n, vector<int> Uedges, vector<int> Vedges, vector<int> Wedges) {

  const ll inf = (ll) 1e18 + 7;

  assert((int) Uedges.size() == n - 1);
  assert((int) Vedges.size() == n - 1);
  assert((int) Wedges.size() == n - 1);

  vector<vector<pair<int, int>>> g(n);
  vector<int> deg(n, 0);
  vector<ll> dp_take(n), dp_not(n);

  int maxDeg;

  vector<int> sub(n), value(n, 0);
  for (int i = 0; i < n - 1; i++) {
    g[Uedges[i]].push_back({Vedges[i], Wedges[i]});
    g[Vedges[i]].push_back({Uedges[i], Wedges[i]});
  }

  for (int root = 0; root < n; root++) {
    sort(g[root].begin(), g[root].end(), [&] (pair<int, int> a, pair<int, int> b) {
        return deg[a.first] < deg[b.first];});
  }

  function<void(int, int)> build = [&] (int a, int p) {
    deg[a] = (int) g[a].size();
    sub[a] = 1;
    vector<pair<int, int>> kids;
    for (auto &it : g[a]) {
      int b = it.first;
      if (b == p) continue;
      value[b] = it.second;
      kids.push_back(it);
      build(b, a);
      sub[a] += sub[b];
    }
    g[a] = kids;
  };

  function<void(int)> dfs = [&] (int a) {
    dp_not[a] = dp_take[a] = +inf;
    if (g[a].empty()) {
      dp_not[a] = value[a];
      if (1 <= maxDeg) {
        dp_take[a] = 0;
      }
      return;
    }

    assert(!g[a].empty());

    int ln = maxDeg;
    vector<ll> T;

    ll sum = 0;

    for (auto &it : g[a]) {
      int b = it.first;
      ll cost = it.second;
      dfs(b);
      sum += dp_not[b];
      T.push_back(dp_take[b] - dp_not[b]);
    }
    sort(T.begin(), T.end());

    for (int d = 0; d <= ln; d++) {
      dp_not[a] = min(dp_not[a], sum + value[a]);
      if (d + 1 <= maxDeg) {
        dp_take[a] = min(dp_take[a], sum);
      }
      if (d < (int) T.size()) {
        sum += T[d];
      }
    }
  };

  build(0, -1);

  vector<ll> print(n, 0);

  for (maxDeg = 0; maxDeg < n; maxDeg++) {
    dfs(0);
    print[maxDeg] = dp_not[0];
  }

  return print;
}

컴파일 시 표준 에러 (stderr) 메시지

roads.cpp: In lambda function:
roads.cpp:68:10: warning: unused variable 'cost' [-Wunused-variable]
   68 |       ll cost = it.second;
      |          ^~~~

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