Pagini recente » Cod sursa (job #2184929) | Cod sursa (job #2363699) | Cod sursa (job #2724702) | Cod sursa (job #399253) | Cod sursa (job #2718437)
#include <bits/stdc++.h>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
const int NMAX = 50001,
INF = INT_MAX / 2;
int n, m, vf;
vector <pair<int, int >> G[NMAX];
set<pair<int, int>>Q;
int d[NMAX];
void citire()
{
f >> n >> m;
while(m--)
{
int x, y, c;
f >> x >> y >> c;
G[x].push_back(make_pair(y, c));
}
}
void Dijkstra(int nod)
{
for(int i = 1; i <= n; i++)
d[i] = INF;
d[nod] = 0;
Q.insert(make_pair(0, nod));
while(!Q.empty())
{
int nod_curent = Q.begin()->second;
int dist = Q.begin()->first;
Q.erase(Q.begin());
//
for(auto &x : G[nod_curent])
{
int y = x.first;
int c = x.second;
if(d[y] > d[nod_curent] + c)
{
if(d[y] != INF)
Q.erase(Q.find(make_pair(d[y], y)));
d[y] = d[nod_curent] + c;
Q.insert(make_pair(d[y], y));
}
}
}
}
void afis()
{
for(int i = 1; i <= n; i++)
g << ((d[i] != INF) ? d[i] : -1) << ' ';
}
int main()
{
citire();
Dijkstra(1);
for (int i = 2; i <= n; ++i)
{
if (d[i] == INF)
{
d[i] = 0;
}
g << d[i] << ' ';
}
g << '\n';
return 0;
}