Submission #1074937

#	Time	Username	Problem	Language	Result	Execution time	Memory
1074937		Osplei	Senior Postmen (BOI14_postmen)	C++17	0 / 100	1087 ms	22512 KiB

postmen

#include <bits/stdc++.h>
 
using namespace std;
 
typedef pair<int,int> ii;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ii> vii; 
typedef vector<vii> wgraf;
typedef pair<int,ii> edge;
typedef vector <ll> vl;
typedef pair <ll, ll> LL;
typedef vector <LL> vll;
 
#define UNVISITED 0
#define VISITED 1
#define pb push_back
#define F first
#define S second
 
ll n, m, u, v, visto[500005];
vll grafo[500005];
map <ll, ll> sale;
map <ll, bool> puede;
bool vale = false;

void dfs(ll origen, ll nodo, ll padre, ll aux) {

  if (nodo == origen && padre != -1) {
    vale = true;
    return;
  }
  
  for (auto i : grafo[nodo]) {

    if (i.F != padre && puede[i.S] == true && visto[i.F] != aux) {
    
      puede[i.S] = false;
      visto[i.F] = aux;
      
      dfs(origen, i.F, nodo, aux);
      
      puede[i.S] = true;
    
    }
    
    if (vale == true) {
    
      if (nodo != origen) cout << nodo << " ";
      else cout << nodo << "\n";
      
      sale[nodo]--;
      sale[i.F]--;

      puede[i.S] = false;

      return;
    
    }

  }

}

void SOLVE(){
  cin >> n >> m;

  for (ll i = 0; i < n; i++) visto[i] = 0;

  for (ll i = 0; i < m; i++){
    cin >> u >> v;

    grafo[u].pb({v, i});
    grafo[v].pb({u, i});

    sale[u]++;
    sale[v]++;

    puede[i] = true;
  }

  ll cnt = 0;

  for (auto i : sale) {
    if(i.S > 0) {
      vale = false;
      cnt++;
      dfs(i.F, i.F, -1, cnt);
      i.S--;
    }
  }
}
 
int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t = 1;
  //cin >> t;
  while(t--){
    SOLVE();
  }
}

• Subtask 1: 0 / 38
• Subtask 2: 0 / 17
• Subtask 3: 0 / 45