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Cod sursa(job #664183)
#include<fstream>
#include<vector>
#include<queue>
#define NMAX 250008
#define INF 4000000
using namespace std;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
int N,M,contor[NMAX],D[NMAX],c;
char viz[NMAX];
vector<int >G[NMAX],C[NMAX];
queue<int>Coada;
void read (){
f>>N>>M;
int x,y,c;
for(int i=1;i<=M;i++){
f>>x>>y>>c;
G[x].push_back(y);
C[x].push_back(c);
}
}
void solve(){
int x;
for(int i=2;i<=N;i++)
D[i]=INF;
viz[1]=1;
D[1]=0;
Coada.push(1);
int ok=1;
while( ok &&Coada.size()){
x=Coada.front();
viz[x]=0;
for(int i=0;i<G[x].size();++i){
if(D[G[x][i]]>D[x]+C[x][i]){
D[G[x][i]]=D[x]+C[x][i];
if(!viz[G[x][i]]){
if(contor[G[x][i]]>N){
g<<"Ciclu negativ!";
return;
}
else{
viz[G[x][i]]=1;
++contor[G[x][i]];
Coada.push(G[x][i]);
}
}
}
}
Coada.pop();
}
for(int i=2;i<=N;++i)
g<<D[i]<<" ";
}
int main (){
read();
solve();
return 0;
}