Cod sursa(job #2233442)

Utilizator AlexandruRudiAlexandru Rudi AlexandruRudi Data 23 august 2018 12:36:26
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.41 kb
#pragma GCC optimize ("O3")
#include <bits/stdc++.h>
using namespace std;
#define x first
#define y second
#define dbg(x) cout << #x << '=' << x << '\n';
#define ll long long
#define pi pair<int,int>
#define pl pair<ll,ll>
#define pd pair<double,double>
#define ld long double
#define pld pair<ld,ld>
#define lg length()
#define sz size()
#define pb push_back
#define MAXN 100005
#define INF 1000000005
#define LINF 1000000000000000005
#define x1 xdddddddddddddddddd
#define y1 ydddddddddddddddddd

int n,m,d[50005],x,y,z,v[50005];

vector <pi> g[50005];

int32_t main(){
    ios_base :: sync_with_stdio(0); cin.tie(); cout.tie();
    ifstream cin("bellmanford.in");
    ofstream cout("bellmanford.out");
    cin >> n >> m;
    for(int i=1;i<=m;i++){
        cin >> x >> y >> z;
        g[x].pb({y,z});
    }
    vector <int> q,p;
    for(int i=1;i<=n;i++) d[i]=INF;
    q.pb(1); d[1]=0;
    for(int i=1;i<=n;i++){
        for(int j : q){
            if(v[j]==i) continue;
            v[j]=i;
            for(pi t : g[j]){
                if(d[t.x]>d[j]+t.y) d[t.x]=d[j]+t.y,p.pb(t.x);
            }
        }
        q=p;
        p.clear();
    }
    for(int i=1;i<=n;i++){
        for(pi j : g[i]){
            if(d[j.x]>d[i]+j.y){
                cout << "Ciclu negativ!";
                return 0;
            }
        }
    }
    for(int i=2;i<=n;i++) cout << d[i] << ' ';
}