Pagini recente » Cod sursa (job #136867) | Cod sursa (job #475448) | Cod sursa (job #2288713) | Cod sursa (job #2692429) | Cod sursa (job #2977476)
#include <iostream>
#include <fstream>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <vector>
#include <queue>
#define ll long long
#define pb push_back
#define bg begin()
#define ed end()
#define cl clear()
#define pii pair<ll, ll>
#define x first
#define y second
#define int ll
using namespace std;
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");
const int MOD = 1e9;
const char nl = '\n';
const int NMAX = 50005;
const int INF = 1e9;
vector<pii> v[NMAX];
priority_queue<pii> pq;
int n, m, dist[NMAX];
void dijkstra(int source){
for(int i = 1; i <= n; ++i)
dist[i] = INF;
dist[source] = 0;
pq.push({0, source});
while(!pq.empty()){
pii top = pq.top();
int cur = top.y;
if(-pq.top().x > dist[cur]){
pq.pop();
continue;
}
pq.pop();
for(auto neigh: v[cur]){
if(dist[neigh.x] > dist[cur] + neigh.y){
dist[neigh.x] = dist[cur] + neigh.y;
pq.push({-dist[neigh.x], neigh.x});
}
}
}
}
void solve(){
dijkstra(1);
for(int i = 2; i <= n; ++i){
if(dist[i] == INF)
out << 0 << ' ';
else
out << dist[i] << ' ';
}
out << nl;
}
signed main(){
in >> n >> m;
for(int i = 1; i <= m; ++i){
int a, b, c;
in >> a >> b >> c;
v[a].pb({b, c});
}
solve();
return 0;
}