## Solución al problema número BLINNET de Spoj - BLINNET.

Cualquier duda no dudes en contactar.

``````#include <bits/stdc++.h>
#define INF 0x3F3F3F3F
using namespace std;

const int MAXN = 100100;

struct edge{
int from, to, weight;
edge(){}
edge(int a, int b, int c){
from = a;
to = b;
weight = c;
}
bool operator<(const edge &other)const{ // sobrecarga de operadores para ordenar
return weight < other.weight;
}
};

struct UF{
int parents[MAXN];
int sz[MAXN];
int components;
int mst_sum;
UF(int n){
for(int i=0;i<n;i++){
parents[i] = i; sz[i] = 1;
}
components = n;
mst_sum = 0;
}
int find(int n){
return n == parents[n] ? n : find(parents[n]);
}
bool isConnected(int a, int b){
return find(a) == find(b);
}
void connect(int a, int b, int weight){
if(isConnected(a, b)) return;
int A,B; A = find(a); B = find(b);
if(sz[A] > sz[B]){
parents[B] = A;
sz[A] += sz[B];
}
else{
parents[A] = B;
sz[B] += sz[A];
}
mst_sum += weight;
components--;
}
};

int main(){
int T,to, weight,num;
cin>>T;
while(T--)
{
vector<edge> edges;
int p; cin>>p;
for(int i=0; i<p;i++)
{
string name; cin>>name>>num;
for(int j=0; j<num;j++)
{
scanf("%d %d",&to, &weight);
edges.push_back(edge(i,to-1,weight));
}
}
UF uf = UF(p);
sort(edges.begin(), edges.end());
for(unsigned int i=0;i<edges.size();i++) uf.connect(edges[i].from, edges[i].to, edges[i].weight);
printf("%d\n",uf.mst_sum);

}
return 0;
}
``````