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Cod sursa(job #702649)
/*#include<iostream>
#include<fstream>
using namespace std;
const int inf=2000;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
long n,m,a[5000][5000],t[50000];
void citire()
{
f>>n>>m;
for(int i=1;i<=n;i++)
for(int j=1;j<=n;j++)
if(i!=j)
a[i][j]=inf;
long x,y,c;
while(f>>x>>y>>c)
a[x][y]=c;
}
void dijkstra()
{
int min,pos=0,ok=0;
while(!ok)
{
min=inf;
for(int i=2;i<=n;i++)
if(a[1][i]<min&&!t[i])
{
min=a[1][i];
pos=i;
}
t[pos]=1;
if(min!=inf)
for(int i=2;i<=n;i++)
if(!t[i]&&a[1][i]>a[1][pos]+a[pos][i])
a[1][i]=a[1][pos]+a[pos][i];
else;
else
ok=1;
}
}
int main()
{
citire();
dijkstra();
for(int i=2;i<=n;i++)
if(a[1][i]==inf)
g<<"0 ";
else
g<<a[1][i]<<" ";
}
*/
#include <cstdio>
const int maxn = 50001;
const int inf = 1 << 30;
FILE *in = fopen("dijkstra.in","r"), *out = fopen("dijkstra.out","w");
struct graf
{
int nod, cost;
graf *next;
};
int n, m;
graf *a[maxn];
int d[maxn], q[maxn];
void add(int where, int what, int cost)
{
graf *q = new graf;
q->nod = what;
q->cost = cost;
q->next = a[where];
a[where] = q;
}
void read()
{
fscanf(in, "%d %d", &n, &m);
int x, y, z;
for ( int i = 1; i <= m; ++i )
{
fscanf(in, "%d %d %d", &x, &y, &z);
add(x, y, z);
}
}
void dijkstra()
{
for ( int i = 2; i <= n; ++i )
d[i] = inf;
int min, pmin = 0;
for ( int i = 1; i <= n; ++i )
{
min = inf;
for ( int j = 1; j <= n; ++j )
if ( d[j] < min && !q[j] )
min = d[j], pmin = j;
q[pmin] = 1;
graf *t = a[pmin];
while ( t )
{
if ( d[ t->nod ] > d[pmin] + t->cost )
d[ t->nod ] = d[pmin] + t->cost;
t = t->next;
}
}
}
int main()
{
read();
dijkstra();
for ( int i = 2; i <= n; ++i )
fprintf(out, "%d ", d[i] == inf ? 0 : d[i]);
fprintf(out, "\n");
return 0;
}