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Cod sursa(job #381791)
#include <stdio.h>
#include <vector>
using namespace std;
#define maxn 50010
#define maxm 250010
#define inf 1000000000
#define pb push_back
struct muchie
{
long a, b, c;
} e[maxm];
long n, m, i, j, k, left, right, cost[maxn], q[maxn], f[maxn], u[maxn];
vector <long> v[maxn];
void init()
{
long i;
cost[1]=0;
for(i=2; i<=n; i++)
cost[i]=inf;
right=1;
q[1]=1;
f[1]=1;
u[1]=1;
}
void solve()
{
long i, j, pas, nod, poz;
for(i=1; i<=right && 1LL * i <= 1LL * n * m; i++)
{
nod=q[i%n];
f[nod]=0;
for(j=0; j<v[nod].size(); j++)
{
poz=v[nod][j];
if(cost[e[poz].a]+e[poz].c<cost[e[poz].b] && u[e[poz].a])
{
cost[e[poz].b]=cost[e[poz].a]+e[poz].c;
u[e[poz].b]=1;
if(!f[e[poz].b])
{
f[e[poz].b]=1;
++right;
q[right%n]=e[poz].b;
}
}
}
}
}
long check_negativ()
{
long i;
for(i=1; i<=m; i++)
if(cost[e[i].a]+e[i].c<cost[e[i].b])
return 1;
return 0;
}
int main()
{
freopen("bellmanford.in", "r", stdin);
freopen("bellmanford.ok", "w", stdout);
scanf("%d%d", &n, &m);
for(i=1; i<=m; i++)
{
scanf("%d%d%d", &e[i].a, &e[i].b, &e[i].c);
v[e[i].a].pb(i);
}
init();
solve();
if(check_negativ())
{
printf("Ciclu negativ!\n");
return 0;
}
for(i=2; i<=n; i++)
printf("%d ", cost[i]);
return 0;
}