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Cod sursa(job #877712)
#include <cstdio>
#include <vector>
#include <queue>
#define NMAX 50002
#define INFINITY (1 << 30)
using namespace std;
int n, m, d[NMAX];
struct cmp
{
bool operator() (const int a, const int b)
{
return d[a] > d[b];
}
};
vector < pair <int, int> > G[NMAX];
priority_queue <int, vector<int>, cmp> Q;
void citire()
{
scanf("%d %d", &n, &m);
for(int i = 1; i <= n; i++)
{
int x, y, cost;
scanf("%d %d %d", &x, &y, &cost);
G[x].push_back(make_pair(y,cost));
}
}
void afisare()
{
for(int i = 2; i <= n; i++)
if(d[i] != INFINITY)
printf("%d ", d[i]);
else
printf("0 ");
}
void dijkstra(int v)
{
for(int i = 1; i <= n; i++)
{
d[i] = INFINITY;
Q.push(i);
}
d[v] = 0;
while(!Q.empty())
{
int x = Q.top();
Q.pop();
int l = G[x].size();
for(int i = 0; i < l; i++)
{
int y = G[x][i].first;
int c = G[x][i].second;
if(d[y] > d[x] + c)
{
d[y] = d[x] + c;
Q.push(y);
}
}
}
}
int main()
{
freopen("dijkstra.in", "r", stdin);
freopen("dijkstra.out", "w", stdout);
citire();
dijkstra(1);
afisare();
return 0;
}