Cod sursa(job #2951124)

Utilizator radubuzas08Buzas Radu radubuzas08 Data 5 decembrie 2022 15:06:02
Problema Algoritmul Bellman-Ford Scor 35
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.08 kb
#include <fstream>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("Ofast")
using namespace std;

#define maxn 50010
#define maxm 250010
#define inf 0x8fffffff

struct muchie
{
    long a, b, c;
} e[maxm];

long n, m, i, j, k, cost[maxn];

void init()
{
    long long i;
    cost[1]=0;
    for(i=2; i<=n; i++)
        cost[i]=inf;
}

void solve()
{
    long long i, j;
    for(i=1; i<=n; i++)
        for(j=1; j<=m; j++)
            if(cost[e[j].a]+e[j].c<cost[e[j].b])
                cost[e[j].b]=cost[e[j].a]+e[j].c;
}

bool check_negativ()
{
    long 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()
{
    ifstream in("bellmanford.in");
    ofstream out("bellmanford.out");

    in >> n >> m;
    for(i=1; i<=m; i++)
        in >> e[i].a >> e[i].b >> e[i].c;
    init();
    solve();
    if(check_negativ())
    {
        out << "Ciclu negativ!\n";
        return 0;
    }
    for(i=2; i<=n; i++)
        out << cost[i] << ' ';
    in.close();
    out.close();
    return 0;
}