Pagini recente » Cod sursa (job #612455) | Cod sursa (job #1438475) | Cod sursa (job #559805) | Cod sursa (job #2784013) | Cod sursa (job #2835405)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
std::ifstream in("bellmanford.in");
std::ofstream out("bellmanford.out");
struct edge
{
int from;
int to;
int cost;
};
const int N=50000;
const int M=250000;
const int INF=9000000;
std::queue<int> q;
std::vector<int> v[N+1];
edge g[M+1];
int d[N+1];
int relax_counter[N+1];
bool inqueue[N+1];
int n, m;
int main()
{
in>>n>>m;
for(int it=1; it<=m; it++)
{
in>>g[it].from>>g[it].to>>g[it].cost;
v[g[it].from].push_back(it);
}
for(int it=1; it<=n; it++)
{
d[it]=INF;
}
d[1]=0;
q.push(1);
inqueue[1]=1;
while(!q.empty())
{
int curr=q.front();
q.pop();
inqueue[curr]=0;
for(int edg : v[curr])
{
int to=g[edg].to;
int cost=g[edg].cost;
if(d[to]>d[curr]+cost)
{
d[to]=d[curr]+cost;
if(!inqueue[to])
{
q.push(to);
inqueue[to]=true;
relax_counter[to]++;
if(relax_counter[to]==n)
{
out<<"Ciclu negativ!";
return 0;
}
}
}
}
}
for(int i=2; i<=n; i++)
{
out<<d[i]<<" ";
}
}