Pagini recente » Cod sursa (job #1628139) | Cod sursa (job #2472338) | Cod sursa (job #578418) | Istoria paginii runda/eusebiu_oji_2017_cls11-12 | Cod sursa (job #2576450)
#include <bits/stdc++.h>
#define FILE_NAME "bellmanford"
#define fast ios_base :: sync_with_stdio(0); cin.tie(0);
#pragma GCC optimize("O3")
#define NMAX 50000 + 100
using namespace std;
ifstream f(FILE_NAME ".in");
ofstream g(FILE_NAME ".out");
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> llp;
typedef pair<ld,ld> pct;
const int inf = 1 << 30;
const ll mod = 1e9 + 7;
const ld eps = 1e-9;
void add(ll &a , ll b)
{
a += b;
a %= mod;
}
void sub(ll &a, ll b)
{
a = (a - b + mod) % mod;
}
int n, m, viz[NMAX], dist[NMAX];
vector <pi> G[NMAX];
bitset <NMAX> inQ;
queue <int> Q;
int Bellman(int start)
{
for(int i = 1; i <= n; ++i)
dist[i] = inf;
dist[start] = 0;
viz[start] = 1;
inQ[start] = 1;
Q.push(start);
while(!Q.empty())
{
int nod = Q.front();
Q.pop();
inQ[nod] = 0;
for(auto it : G[nod])
{
int urm = it.first;
int cost = it.second;
if(dist[nod] + cost < dist[urm])
{
dist[urm] = dist[nod] + cost;
viz[urm]++;
if(viz[urm] >= n - 1)
return 0;
if(!inQ[urm])
{
inQ[urm] = 1;
Q.push(urm);
}
}
}
}
return 1;
}
int main()
{
f >> n >> m;
for(int x,y,z, i = 1; i <= m; ++i)
{
f >> x >> y >> z;
G[x].push_back({y,z});
}
if(Bellman(1) == 0)
g << "Ciclu negativ!";
else
for(int i = 2; i <= n; ++i)
g << dist[i] << ' ';
f.close();
g.close();
return 0;
}