Pagini recente » Cod sursa (job #2464914) | Cod sursa (job #2011280) | Cod sursa (job #2149214) | Cod sursa (job #132689) | Cod sursa (job #856779)
Cod sursa(job #856779)
#include<fstream>
#include<vector>
#include<cstring>
#define Nmax 50010
#define nrmax 1000000
#define INFI 0x3f3f3f3f
using namespace std;
int i, n, m, x, y, z, viz[Nmax], start, stop, nr, bun[Nmax], j, lung, nc;
struct cost
{
int nod;
int c;
};
vector <cost> muchie[Nmax];
vector <int> coada;
int sol ()
{
for (i = 1; i <= n; ++i)
{
lung = muchie[i].size();
for (j = 0; j < lung; ++j)
{
if (bun[i] + muchie[i][j].c < bun[muchie[i][j].nod])
return 1;
}
return 0;
}
}
int main()
{
ifstream f("bellmanford.in");
ofstream h("bellmanford.out");
f >> n >> m;
for (i = 1; i <= m; ++i)
{
f >> x >> y >> z;
muchie[x].push_back(cost{y, z});
}
f.close();
memset (bun, INFI, sizeof(bun));
start = stop = 0;
coada.push_back(1);
nr = 0;
bun[1] = 0;
viz[1] = 1;
while (start <= stop)
{
nc = coada[start];
viz[nc] = 0;
lung = muchie[nc].size();
for (i = 0; i < lung; ++i)
{
if (bun[muchie[nc][i].nod] > bun[nc] + muchie[nc][i].c)
{
bun[muchie[nc][i].nod] = bun[nc] + muchie[nc][i].c;
if (viz[muchie[nc][i].nod] == 0)
{
coada.push_back(muchie[nc][i].nod);
viz[muchie[nc][i].nod] = 1;
++stop;
}
}
++nr;
}
++start;
if (nr > nrmax)
break;
}
if (sol())
h << "Ciclu negativ!\n";
else
for (i = 2; i <= n; ++i)
h << bun[i] << " ";
h.close();
return 0;
}