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Cod sursa(job #862065)
#include<fstream>
#define INF 1000000000
#define NMAX 5010
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
int n, m, start;
int C[NMAX][NMAX], total[NMAX], cmin[NMAX];
void citire();
void initializare();
int bf(int start);
void afisare();
int main()
{
citire();
afisare();
return 0;
}
void citire()
{
int i, j, x, y, cost;
fin>>n>>m; start=1;
for(i=1; i<=n; i++)
for(j=1; j<=n; j++)
if(i!=j) C[i][i]=INF;
for(i=1; i<=m; i++)
{
fin>>x>>y>>cost; C[x][y]=cost;
}
}
int bf(int start)
{
int i, j, x, op;
for(i=1; i<=n; i++) cmin[i]=INF;
cmin[start]=0;
for(i=1; i<=n; i++)
{
op=0;
for(j=1; j<=n; j++)
for(x=1; x<=n; x++)
if(cmin[x]>cmin[j]+C[j][x])
{
cmin[x]=cmin[j]+C[j][x];
total[x]=j; op=1;
}
}
return op;
}
void afisare()
{
int i, x;
x=bf(start);
if(x==1) fout<<"Ciclu negativ!"<<'\n';
else
for(i=2; i<=n; i++) fout<<cmin[i]<<'\n';
fout.close();
}