Pagini recente » Cod sursa (job #839680) | Cod sursa (job #2215620) | Cod sursa (job #2870067) | Cod sursa (job #450322) | Cod sursa (job #500086)
Cod sursa(job #500086)
#include <stdio.h>
#include <queue>
#include <vector>
using namespace std;
#define MN (50000)
#define INF (50000001) // MN*1000+1 with 1000 being the maximum cost of an edge
vector<int> g[MN]; // graph
vector<int> c[MN]; // cost
int d[MN]; // distance
int N; // number of nodes
int M; // number of edges
class cmp {
public:
bool operator()(const pair<int, int> &n1, const pair<int, int> &n2)
{
return n1.second > n2.second;
}
};
priority_queue< pair<int, int>, vector< pair<int, int> >, cmp> q; // node, distance
void dijkstra(int startNode)
{
int i, n1, n2, n1d;
for(i = 0; i < N; ++i)
d[i] = INF;
q.push(make_pair(startNode, d[startNode] = 0));
while(!q.empty()) {
n1 = q.top().first;
n1d = q.top().second;
q.pop();
if(n1d > d[n1])
continue;
//printf("Using %d with %d\n", n1, n1d);
for(i = 0; i < g[n1].size(); ++i) {
n2 = g[n1][i];
if(d[n1]+c[n1][i] < d[n2]) {
d[n2] = d[n1]+c[n1][i];
q.push(make_pair(n2, d[n2]));
}
}
}
}
int main()
{
freopen("dijkstra.in", "r", stdin);
freopen("dijkstra.out", "w", stdout);
int i, A, B, C;
scanf("%d %d", &N, &M);
for(i = 0; i < M; ++i) {
scanf("%d %d %d", &A, &B, &C); --A; --B;
g[A].push_back(B);
c[A].push_back(C);
}
dijkstra(0);
for(i = 1; i < N; ++i)
printf("%d ", d[i] == INF? 0 : d[i]);
return 0;
}