Pagini recente » Cod sursa (job #272290) | Istoria paginii home | Probleme de Taietura | Cod sursa (job #386568) | Cod sursa (job #2187744)
#include <bits/stdc++.h>
using namespace std;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
int n,m;
bool incoada[50005];
int ncoada[50005];
int parinte[50005];
int cost[50005];
vector <pair <int,int>> v[50005];
queue <int> Q;
int bellman_ford(int nod) {
int nou,c;
Q.push(nod);
cost[nod]=0;
incoada[nod]=1;
ncoada[nod]=1;
while (!Q.empty()) {
nod = Q.front();
Q.pop();
incoada[nod] =0;
for(int i=0;i<v[nod].size();i++) {
nou = v[nod][i].first;
c= v[nod][i].second;
if(cost[nou]>c+cost[nod]) {
cost[nou]=c+cost[nod];
if(!incoada[nou]) {
if (ncoada[nou]>n)
return 0;
else {
Q.push(nou);
incoada[nou]=1;
ncoada[nou]++;
}
}
}
}
}
return 1;
}
int main()
{
int x,y,c,s;
in>>n>>m;
for(int i=1;i<m;i++) {
in>>x>>y>>c;
v[x].push_back(make_pair(y,c));
}
for(int i=1;i<=n;i++) {
cost[i] = INT_MAX;
}
if (bellman_ford(1) == 0) {
out<<"Ciclu negativ!\n";
return 0;
}
for(int i=2;i<=n;i++) {
out<<cost[i]<<' ';
}
return 0;
}