Pagini recente » Cod sursa (job #791143) | Cod sursa (job #631556) | Cod sursa (job #1548068) | Cod sursa (job #2278940) | Cod sursa (job #2576492)
#include<iostream>
#include<fstream>
#include<vector>
#include<limits.h>
#include<queue>
#define N 50010
using namespace std;
ifstream f("bellmanford.in");
ofstream o("bellmanford.out");
int n,m,d[N],ap[N];
queue <int> q;
vector <pair<int,int> > v[N];
void citire(){
f>>n>>m; int i,x,y,c;
for(i=1;i<=m;i++){
f>>x>>y>>c;
v[x].push_back(make_pair(y,c));
}
}
void init(){
d[1]=0;
int i;
for(i=2;i<=n;i++)
d[i]=INT_MAX;
q.push(1);
}
bool bellman(){
init(); int i,nod,nv,cv;
while(q.size()){
nod=q.front();
q.pop();
if(ap[nod]>=n){
o<<"Ciclu negativ!";
return 0;
}
for(i=0;i<v[nod].size();i++){
nv=v[nod][i].first;
cv=v[nod][i].second;
if(d[nod]+cv<d[nv]){
ap[nv]++;
d[nv]=d[nod]+cv;
q.push(nv);
}
}
}
return 1;
}
int main(){
citire(); int i;
if(bellman())
for(i=2;i<=n;i++)
o<<d[i]<<" ";
o.close();
f.close();
}