Pagini recente » Cod sursa (job #1845876) | Cod sursa (job #1183676) | Monitorul de evaluare | Cod sursa (job #2273504) | Cod sursa (job #1620440)
#include <fstream>
#include <queue>
#include <vector>
#include <limits>
using namespace std;
const int INF = numeric_limits<int>::max();
struct minHeapOrder
{
bool operator()(const pair<int, int> &a, const pair<int, int> &b)
{
return a.second > b.second;
}
};
int main()
{
int i, N, M, A, B, C;
ifstream f("dijkstra.in");
f >> N >> M;
vector<pair<int, int>> adjList[N + 1];
for (i = 1; i <= M; i++)
{
f >> A >> B >> C;
adjList[A].push_back(make_pair(B, C));
}
f.close();
int dist[N + 1];
fill(dist, dist + N + 1, INF);
dist[1] = 0;
priority_queue<pair<int, int>, vector<pair<int, int>>, minHeapOrder> pq;
pq.push(make_pair(1, dist[1]));
pair<int, int> x;
pair<int, int> neighbor;
while (!pq.empty())
{
x = pq.top(), pq.pop();
for (i = 0; i < adjList[x.first].size(); i++)
{
neighbor = adjList[x.first][i];
if (dist[neighbor.first] > dist[x.first] + neighbor.second)
{
dist[neighbor.first] = dist[x.first] + neighbor.second;
pq.push(make_pair(neighbor.first, dist[neighbor.first]));
}
}
}
ofstream g("dijkstra.out");
for (i = 2; i <= N; i++)
{
if (dist[i] == INF)
g << 0;
else
g << dist[i];
g << ' ';
}
g.close();
return 0;
}