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Cod sursa(job #652825)
#include <cstdio>
#include <climits>
#include <vector>
#include <queue>
typedef unsigned int uint;
typedef std::vector< std::vector<uint> > graph;
typedef std::vector< std::vector<int> > weightFunc;
std::vector<int> BellmanFord(graph &G,uint v,uint e,weightFunc &we,uint src,uint dest)
{
std::queue<uint> Q;
std::vector<bool> inQ(v);
std::vector<int> d(v);
for(uint i = 0;i < v; ++i)
{
d[i] = INT_MAX;
}
Q.push(src);
inQ[src] = true;
d[src] = 0;
for(uint i = 0;i < v - 1; ++i)
{
uint c = Q.front();
Q.pop();
inQ[c] = false;
for(uint j = 0; j < G[c].size(); ++j)
{
if( d[ G[c][j] ] > d[ c ] + we[c][j] )
{
d [ G[c][j] ] = d[ c ] + we[c][j];
if(G[c][j] != dest)
{
Q.push( G[c][j] );
inQ[ G[c][j] ] = true;
}
}
}
}
// daca mai sunt elemente in coada inseamna ca
// s-a gasit cel putin un ciclu de cost negativ
if(!Q.empty())
{
d.clear();
}
return d;
}
int main()
{
freopen("bellmanford.in","r",stdin);
freopen("bellmanford.out","w",stdout);
uint v,e;
scanf("%u%u",&v,&e);
graph G(v);
weightFunc we(v);
for(uint i = 0; i < e; ++i)
{
uint x,y;
int w;
scanf("%u%u%d",&x,&y,&w);
--x; --y;
G[x].push_back(y); we[x].push_back(w);
}
std::vector<int> res = BellmanFord(G,v,e,we,0,v - 1);
if( res.empty() )
{
printf("Ciclu negativ!");
}
else
{
for(int i=1;i<v;++i)
{
printf("%d ",res[i]);
}
}
return 0;
}