Pagini recente » Cod sursa (job #3269392) | Cod sursa (job #3004731) | Cod sursa (job #1032795) | Cod sursa (job #2931627) | Cod sursa (job #879702)
Cod sursa(job #879702)
#include<stdio.h>
#include<vector>
#include<utility>
#include<list>
#include<queue>
using namespace std;
#define inf 2000000
typedef pair <int, int> per;
int n,m,x,y,v;
vector<list<per> >graf;
list<per>::iterator it, last;
vector <bool> inCoada;
vector <int> aparitii, dist;
per aux;
int bellman()
{
int top, nod, cost;
queue<int> coada;
++aparitii[1];
dist[1] = 0;
coada.push(1);
while(!coada.empty())
{
top=coada.front();
inCoada[top] = 0;
coada.pop();
last=graf[top].end();
for(it=graf[top].begin();it!=last;it++)
{
nod=it->first; cost=it->second;
if(dist[nod]>dist[top]+cost)
{
dist[nod]=dist[top]+cost;
if(!inCoada[nod])
inCoada[nod] = true, coada.push(nod);
++aparitii[nod];
if(aparitii[nod] >= n) return 0;
}
}
}
for(int i = 2; i <= n; ++i)
printf("%d ",dist[i]);
return 1;
}
int main()
{
freopen("bellmanford.in","r",stdin);
freopen("bellmanford.out","w",stdout);
scanf("%d%d",&n,&m);
graf.resize(n+1);
inCoada.resize(n+1);
aparitii.resize(n+1);
dist.resize(n+1, inf);
for(int i = 1; i <= m; ++i){
scanf("%d %d %d",&x,&aux.first,&aux.second);
graf[x].push_back(aux);
}
if(!bellman()) printf("Ciclu negativ!");
}