Pagini recente » Cod sursa (job #2690838) | Cod sursa (job #2035740) | Monitorul de evaluare | Diferente pentru concursuri intre reviziile 182 si 65 | Cod sursa (job #2535870)
#include <iostream>
#include <cstdio>
using namespace std;
const int N = 50001;
const int M = 250001;
const int INF = 1e9;
int vf[M], urm[M], cost[M], lst[N], q[N+2], d[N], nrq[N];
bool inq[N];
int n, nr, st, dr=-1;
void adauga(int x, int y, int c){
vf[++nr] = y;
cost[nr] = c;
urm[nr] = lst[x];
lst[x] = nr;
}
void adauga_q(int x){
nrq[x]++;
if(inq[x] == true)
return;
if(dr == N+1)
dr = 0;
else
dr++;
q[dr] = x;
inq[x] = true;
}
int bellman_ford(int x0){
for(int i=1; i<=n; i++)
d[i] = INF;
adauga_q(x0);
d[x0] = 0;
while(dr != st-1){
int node = q[st++];
inq[node] = false;
for(int p=lst[node]; p!=0; p=urm[p]){
int next = vf[p];
int c = cost[p];
if(d[node] + c < d[next]){
d[next] = d[node] + c;
adauga_q(next);
if(nrq[next] == n)
return false;
}
}
}
return true;
}
int main()
{
FILE *fin, *fout;
int m,i,x,y,c;
fin = fopen("bellmanford.in","r");
fout = fopen("bellmanford.out","w");
fscanf(fin,"%d %d",&n,&m);
for(i=0; i<m; i++){
fscanf(fin,"%d %d %d",&x,&y,&c);
adauga(x,y,c);
}
if(bellman_ford(1)){
for(i=2; i<=n; i++)
fprintf(fout,"%d ",d[i]);
}
else
fprintf(fout,"Ciclu negativ!");
fclose(fin);
fclose(fout);
return 0;
}