Cod sursa(job #520502)

Utilizator BlaugranasEnal Gemaledin Blaugranas Data 9 ianuarie 2011 11:52:41
Problema Algoritmul Bellman-Ford Scor 85
Compilator cpp Status done
Runda Arhiva educationala Marime 1.56 kb
#include<stdio.h>
#include<stdlib.h>
#define N 50001
typedef struct nod1
{unsigned int info1;
struct nod1 *next;}Nod1;
typedef struct
{Nod1 *prim1,*ultim1;}coada1;
typedef struct nod2
{unsigned int info2;
int cost;
struct nod2 *urm;}Nod2,*list;
typedef list graf[N];
graf g;

void push1(coada1 &q,unsigned int x)
{Nod1 *c=new Nod1;
c->info1=x;
c->next=NULL;
if(q.prim1==NULL)
       q.prim1=q.ultim1=c;
else
       {q.ultim1->next=c;
       q.ultim1=c;}}
       
unsigned int pop1(coada1 &q)
{unsigned int x=q.prim1->info1;
Nod1 *t=q.prim1->next;
free(q.prim1);
q.prim1=t;
if(q.prim1==NULL)
       q.ultim1=NULL;
return x;}

void push2(list &r,unsigned int x,int co)
{Nod2 *c=new Nod2;
c->info2=x;
c->cost=co;
c->urm=r;
r=c;}

int main()
{unsigned int n,i,j;
int co;
long m,k,d[N];
freopen("bellmanford.in","r",stdin);
freopen("bellmanford.out","w",stdout);
coada1 q1;
q1.prim1=q1.ultim1=NULL;
list r;
scanf("%u%ld",&n,&m);
for(i=1;i<=n;i++)
      {d[i]=N;
      g[i]=NULL;}
for(k=1;k<=m;k++)
      {scanf("%u%u%d",&i,&j,&co);
      push2(g[i],j,co);}
d[1]=0;
push1(q1,1);
while(q1.prim1!=NULL)
      {i=pop1(q1);
      for(r=g[i];r!=NULL;r=r->urm)
      if(d[r->info2]>d[i]+r->cost)
            {d[r->info2]=d[i]+r->cost;
            push1(q1,r->info2);}
      else
            if(d[r->info2]>0&&d[i]<0)
                    {printf("Ciclu negativ!");
                    return 0;}}
for(i=2;i<=n;i++)
if(d[i]>0)
      printf("%ld ",d[i]%N);
else
      printf("%ld ",d[i]);
fclose(stdin);
fclose(stdout);
return 0;}