Pagini recente » Cod sursa (job #2971428) | Cod sursa (job #2616863) | Cod sursa (job #543234) | Cod sursa (job #370340) | Cod sursa (job #1329938)
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#define nmax 200005
using namespace std;
ifstream fin ("apm.in");
ofstream fout ("apm.out");
vector< pair< pair<int, int>, int > > sorted;
int n, m;
int v[nmax];
bool cmp(pair< pair<int, int> , int > a, pair< pair<int, int> , int > b){
return a.second < b.second;
}
int find_rep(int x){
if(v[x]<0) return x;
else{
v[x]= find_rep(v[x]);
return v[x];
}
}
void quick_union(int x, int y){
if(v[x]>v[y]){
v[y]+= v[x];
v[x]= y;
}
else{
v[x]+=v[y];
v[y]= x;
}
}
int main(){
int x, y, w, sum=0, t=0;
fin >> n >> m;
for(int i=1; i<=n; i++) v[i]= -1;
for(int i=1; i<=m; i++){
fin >> x >> y >> w;
sorted.push_back(make_pair(make_pair(x, y), w));
}
sort(sorted.begin(), sorted.end(), cmp);
for(int i=0; i<=m; i++){
int a= find_rep(sorted[i].first.first);
int b= find_rep(sorted[i].first.second);
if(a!=b){
quick_union(a, b);
sum+= sorted[i].second;
t++;
}
if(t==n-1) break;
}
fout << sum << "\n" << t << "\n";
for(int i=0; i<t; i++) fout << sorted[i].first.second << " " << sorted[i].first.first << "\n";
return 0;
}