Pagini recente » Cod sursa (job #2947470) | Cod sursa (job #2108227) | Cod sursa (job #1435378) | Cod sursa (job #1539434) | Cod sursa (job #998831)
Cod sursa(job #998831)
#include <algorithm>
#include <fstream>
#include <iostream>
#include <queue>
using namespace std;
#define FORIT(it, v) for(vector<pair<int, int> > :: iterator it = (v).begin(); it != (v).end(); ++it)
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");
const int max_n = 50005, inf = 0x3f3f3f3f;
vector<pair<int,int> > vertex[max_n];
priority_queue<pair<int, int> > pq;
bool viz[max_n];
int best[max_n];
int main() {
int n, m;
in >> n >> m;
for (int i = 1; i <= m; ++i) {
int a, b, c;
in >> a >> b >> c;
vertex[a].push_back(make_pair(b, c));
//vertex[b].push_back(make_pair(a, c));
}
for (int i = 1; i <= n; ++i)
best[i] = inf;
pq.push(make_pair(0, 1));
best[1] = 0;
while (pq.size()) {
int nod = pq.top().second;
pq.pop();
if (viz[nod])
continue;
viz[nod] = true;
FORIT(it, vertex[nod])
if (best[nod] + it->second < best[it->first]) {
best[it->first] = best[nod] + it->second;
pq.push(make_pair(-best[it->first], it->first));
}
}
for (int i = 1; i <= n; ++i)
best[i] = (best[i] == inf) ? (0) : (best[i]);
for (int i = 2; i <= n; ++i)
out << best[i] << " ";
return 0;
}