제출 #1336740

#제출 시각아이디문제언어결과실행 시간메모리
1336740SmuggingSpunVillage (BOI20_village)C++20
100 / 100
41 ms16592 KiB
#include<bits/stdc++.h>
#define taskname "B"
using namespace std;
typedef long long ll;
template<class T>bool minimize(T& a, T b){
  if(a > b){
    a = b;
    return true;
  }
  return false;
}
template<class T>bool maximize(T& a, T b){
  if(a < b){
    a = b;
    return true;
  }
  return false;
}
const int lim = 1e5 + 5;
const int INF = 1e9;
int n;
vector<int>g[lim];
namespace sub1{
  void solve(){
    vector<vector<int>>dis(n + 1, vector<int>(n + 1));
    function<void(const int, int, int)>dfs;
    dfs = [&] (const int root, int s, int p){
      for(int& d : g[s]){
        if(d != p){
          dis[root][d] = dis[root][s] + 1;
          dfs(root, d, s);
        }
      }  
    };
    for(int i = 1; i <= n; i++){
      dfs(i, i, dis[i][i] = 0);
    }
    vector<int>p(n), ami(n), ama(n);
    int val_mi = INF, val_ma = -INF;
    iota(p.begin(), p.end(), 0);
    do{
      bool flag = true;
      int sum = 0;
      for(int i = 0; i < n; i++){
        if(i == p[i]){
          flag = false;
          break;
        }
        sum += dis[i + 1][p[i] + 1];
      }
      if(flag){
        if(minimize(val_mi, sum)){
          ami = p;
        }
        if(maximize(val_ma, sum)){
          ama = p;
        }
      }
    } while(next_permutation(p.begin(), p.end()));
    cout << val_mi << " " << val_ma << "\n";
    for(int& i : ami){
      cout << i + 1 << " ";
    }
    cout << "\n";
    for(int& i : ama){
      cout << i + 1 << " ";
    }
  }
}
namespace sub23{
  int vmin = 0, par[lim], pmax[lim], pmin[lim], siz[lim];
  ll vmax = 0;
  vector<int>tour;
  void dfs(int s){
    tour.push_back(s);
    siz[s] = 1;
    for(int& d : g[s]){
      if(d != par[s]){
        par[d] = s;
        dfs(d);
        siz[s] += siz[d];
        vmax += min(siz[d], n - siz[d]);
      }
    }
  }
  void solve(){
    par[1] = 0;
    dfs(1);
    for(int i = 0; i < n; i++){
      pmax[tour[i]] = tour[(i + (n >> 1)) % n];
    }
    reverse(tour.begin(), tour.end());
    vector<bool>proc(n + 1, false);
    iota(pmin + 1, pmin + n + 1, 1);
    for(int& i : tour){
      if(!proc[i]){
        vmin += 2;
        int j = par[i];
        if(j == 0){
          j = g[1][0];
        }
        swap(pmin[i], pmin[j]);
        proc[j] = true;
      }
    }
    cout << vmin << " " << (vmax << 1LL) << "\n";
    for(int i = 1; i <= n; i++){
      cout << pmin[i] << " ";
    }
    cout << "\n";
    for(int i = 1; i <= n; i++){
      cout << pmax[i] << " ";
    }
  }
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
  cin >> n;
  for(int i = 1; i < n; i++){
    int u, v;
    cin >> u >> v;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  if(n <= 10){
    sub1::solve();
  }
  else{
    sub23::solve();
  }
}

컴파일 시 표준 에러 (stderr) 메시지

Village.cpp: In function 'int main()':
Village.cpp:119:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  119 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
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