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Cod sursa(job #144820)
#include <stdio.h>
#include <vector>
#include <set>
using namespace std;
#define PII pair<int, int>
#define pb push_back
#define mp make_pair
#define f first
#define s second
#define INF 2000000001
int N, M, dist[50005];
vector<PII> G[50005];
set<PII> HEAP;
void dijkstra(int sursa)
{
int i, j, ind, sz, x, cost;
set<PII>::iterator head;
for (i = 2; i <= N; ++i)
{
dist[i] = INF;
HEAP.insert( mp(dist[i], i) );
}
dist[sursa] = 0;
HEAP.insert( mp(dist[sursa], sursa) );
for (i = 1; i < N; ++i)
{
head = HEAP.begin();
ind = head->s;
HEAP.erase(head);
if (dist[ind] == INF)
return ;
for (sz = G[ind].size(), j = 0; j < sz; ++j)
{
x = G[ind][j].f;
cost = G[ind][j].s;
if (dist[ind] + cost < dist[x])
{
head = HEAP.find( mp(dist[x], x) );
HEAP.erase(head);
dist[x] = dist[ind] + cost;
HEAP.insert( mp(dist[x], x) );
}
}
}
}
int main(void)
{
int i, j, c;
freopen("dijkstra.in", "r", stdin);
freopen("dijkstra.out", "w", stdout);
scanf("%d %d", &N, &M);
for (; M; --M)
{
scanf("%d %d %d", &i, &j, &c);
G[i].pb( mp(j, c) );
if (i == j)
for (;;);
}
dijkstra(1);
for (i = 2; i <= N; ++i)
printf("%d ", (dist[i] == INF) ? (0) : (dist[i]) );
printf("\n");
return 0;
}