Nu aveti permisiuni pentru a descarca fisierul grader_test34.ok
Cod sursa(job #2457383)
| Utilizator | Data | 17 septembrie 2019 16:56:04 | |
|---|---|---|---|
| Problema | Algoritmul lui Dijkstra | Scor | 90 |
| Compilator | cpp-64 | Status | done |
| Runda | Arhiva educationala | Marime | 1.19 kb |
#include <iostream>
#include<fstream>
#include<vector>
#include<set>
using namespace std;
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");
int dist[50010];
int n,m;
vector<std::pair<int,int>> drumuri [50010];
void read()
{
int a,b,c;
in>>n>>m;
for(int i=0; i<n; i++)
dist[i]=-1;
for(int i=0; i<m; i++)
{
in>>a>>b>>c;
drumuri[a-1].push_back(std::pair<int,int>(b-1,c));
}
}
void dijkstra()
{
set<std::pair<int,int>> valori;
valori.insert(std::pair<int,int>(0,0));
while(valori.size())
{
std::pair<int,int>nod=*valori.begin();
valori.erase(valori.begin());
int index=nod.second;
int val=nod.first;
for(unsigned i=0; i<drumuri[index].size(); i++)
{
int nv=val+drumuri[index][i].second;
int nindex=drumuri[index][i].first;
if(nv< dist[nindex] || dist[nindex]==-1)
{
dist[nindex]=nv;
valori.insert(std::pair<int,int>(nv,nindex));
}
}
}
}
void prt()
{
for(int i=1; i<n; i++)
out<<max(dist[i],0)<<" ";
}
int main()
{
read();
dijkstra();
prt();
return 0;
}
