Pagini recente » Cod sursa (job #668436) | Cod sursa (job #224530) | Cod sursa (job #1151339) | Cod sursa (job #3039827) | Cod sursa (job #1118627)
#include <cstring>
#include <iostream>
#include <fstream>
#include <bitset>
#include <vector>
#include <queue>
using namespace std;
#define MAXN 50005
#define INF 0x3f3f3f3f
typedef vector< pair<int, int> >::iterator iter;
FILE* f = fopen("dijkstra.in", "r");
FILE* g = fopen("dijkstra.out", "w");
int n, m;
vector< pair<int ,int> > G[MAXN];
priority_queue< pair<int, int> > pq;
bitset<MAXN> viz;
int dist[MAXN];
int dijkstra(int nod, int* dist)
{
for (int i = 1; i <= n; i++) {
dist[i] = INF;
}
viz.reset();
dist[nod] = 0;
pq.push(make_pair(0, nod));
while (!pq.empty()) {
int nd = pq.top().second;
pq.pop();
if (viz[nd] == true) {
continue;
}
viz[nd] = true;
for (iter it = G[nd].begin(); it != G[nd].end(); it++) {
if (dist[it->first] > dist[nd] + it->second) {
dist[it->first] = dist[nd] + it->second;
pq.push(make_pair(-dist[it->first], it->first));
}
}
}
}
int main()
{
fscanf(f, "%d %d\n", &n, &m);
for (int i = 1, x, y, c; i <= m; i++) {
fscanf(f, "%d %d %d\n", &x, &y, &c);
G[x].push_back(make_pair(y, c));
}
dijkstra(1, dist);
for (int i = 2; i <= n; i++) {
fprintf(g, "%d ", (dist[i] == INF) ? (0) : (dist[i]));
}
return 0;
}