Submission #1107232

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107232		santi3223	Parachute rings (IOI12_rings)	C++17	Compilation error	0 ms	0 KiB

rings

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vl vector<ll>
#define pb push_back
#define ff(i, p, x) for (ll i = p; i < x; i++)
#define all(a) (a).begin(), (a).end()
#define ed "\n"
//me faltan declarar los vectores xd

void Init(int N_) {
  n = (long long)N_;
  Grafo.assign(n, vector<long long>());
}

void Link(ll A, ll B){
    A--; B--;
    gra[A].push_back(B);
    gra[B].push_back(A);
    grado[A]++;
    grado[B]++;
}

void dfs(ll nodo){
    visitado[nodo] = true;
    for(auto &vecino : gra[nodo]){
        if(!visitado[vecino]){
            dfs(vecino);
        }
    }
}

bool esCadena(ll excluido){
    fill(visitado.begin(), visitado.end(), false);
    ll componentes = 0;
    ff(i, 0, N){
        if(i != excluido && !visitado[i]){
            componentes++;
            dfs(i);
        }
    }

    return componentes == 1; // Solo debe haber un componente conectado ..?
}

int CountCritical(){
    ll criticos = 0;
    ff(i, 0, N){
        if(grado[i] <= 2){
            if(esCadena(i)){
                criticos++;
            }
        }
    }

    return criticos;
}

int main() {
    // Ejemplo de uso
    Init(7);
    cout << CountCritical() << ed; // Debería devolver 7
    Link(1, 2);
    cout << CountCritical() << ed; // Debería devolver 7
    Link(0, 5);
    cout << CountCritical() << ed; // Debería devolver 7
    Link(2, 0);
    cout << CountCritical() << ed; // Debería devolver 7
    Link(3, 2);
    cout << CountCritical() << ed; // Debería devolver 4
    Link(3, 5);
    cout << CountCritical() << ed; // Debería devolver 3
    Link(4, 3);
    cout << CountCritical() << ed; // Debería devolver 2

    return 0;
}

//Por ahí va la idea, seguro da comp error, pero algo asi es la solución

Compilation message (stderr)

rings.cpp: In function 'void Init(int)':
rings.cpp:12:3: error: 'n' was not declared in this scope; did you mean 'yn'?
   12 |   n = (long long)N_;
      |   ^
      |   yn
rings.cpp:13:3: error: 'Grafo' was not declared in this scope
   13 |   Grafo.assign(n, vector<long long>());
      |   ^~~~~
rings.cpp: In function 'void Link(long long int, long long int)':
rings.cpp:18:5: error: 'gra' was not declared in this scope
   18 |     gra[A].push_back(B);
      |     ^~~
rings.cpp:20:5: error: 'grado' was not declared in this scope
   20 |     grado[A]++;
      |     ^~~~~
rings.cpp: In function 'void dfs(long long int)':
rings.cpp:25:5: error: 'visitado' was not declared in this scope
   25 |     visitado[nodo] = true;
      |     ^~~~~~~~
rings.cpp:26:24: error: 'gra' was not declared in this scope
   26 |     for(auto &vecino : gra[nodo]){
      |                        ^~~
rings.cpp: In function 'bool esCadena(long long int)':
rings.cpp:34:10: error: 'visitado' was not declared in this scope
   34 |     fill(visitado.begin(), visitado.end(), false);
      |          ^~~~~~~~
rings.cpp:36:14: error: 'N' was not declared in this scope
   36 |     ff(i, 0, N){
      |              ^
rings.cpp:6:40: note: in definition of macro 'ff'
    6 | #define ff(i, p, x) for (ll i = p; i < x; i++)
      |                                        ^
rings.cpp: In function 'int CountCritical()':
rings.cpp:48:14: error: 'N' was not declared in this scope
   48 |     ff(i, 0, N){
      |              ^
rings.cpp:6:40: note: in definition of macro 'ff'
    6 | #define ff(i, p, x) for (ll i = p; i < x; i++)
      |                                        ^
rings.cpp:49:12: error: 'grado' was not declared in this scope
   49 |         if(grado[i] <= 2){
      |            ^~~~~