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Cod sursa(job #936734)
#include <cstdio>
#include <vector>
#include <queue>
#define NMAX 50001
#define INF (1 << 30)
using namespace std;
int n;
int d[NMAX];
struct cmp
{
bool operator () (const int a, const int b) const
{
return d[a] > d[b];
}
};
vector < pair < int, int > > vecin[NMAX];
priority_queue < int, vector < int >, cmp > Q;
void citire()
{
int m, x, y, c;
freopen("dijkstra.in", "r", stdin);
scanf("%d %d", &n, &m);
while(m --)
{
scanf("%d %d %d", &x, &y, &c);
vecin[x].push_back(make_pair(y, c));
}
}
void dijkstra(int start)
{
Q.push(start);
for(int i = 1; i <= n; d[i ++] = INF);
d[start] = 0;
while(!Q.empty())
{
int x = Q.top();
Q.pop();
unsigned int m = vecin[x].size();
for(unsigned int i = 0; i < m; ++ i)
{
int y = vecin[x][i].first;
int cost = vecin[x][i].second;
if(d[y] > d[x] + cost)
{
d[y] = d[x] + cost;
Q.push(y);
}
}
}
}
void afisare_distante()
{
freopen("dijkstra.out", "w", stdout);
for(int i = 2; i <= n; ++ i)
if(d[i] == INF)
printf("0 ");
else
printf("%d ", d[i]);
printf("\n");
}
int main()
{
citire();
dijkstra(1);
afisare_distante();
return 0;
}