Cod sursa(job #3269621)

Utilizator game_difficultyCalin Crangus game_difficulty Data 20 ianuarie 2025 08:56:41
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.36 kb
#include <fstream>
#include <queue>
#include <vector>

using namespace std;

ifstream cin("bellmanford.in");
ofstream cout("bellmanford.out");

const int N = 50005;
const int M = 250005;
const int INF = 1 << 30;
struct muchie {
    int dest, cost;
};
vector<muchie> graf[N];
int cost[N];
bool inqueue[N];
int nrimprove[N];

int main()
{
    int n, m;
    cin >> n >> m;
    for(int i = 1; i <= m; i++) {
        int x, y, c;
        cin >> x >> y >> c;
        graf[x].push_back({y, c});
    }
    cost[1] = 0;
    for(int i = 2; i <= n; i++) {
        cost[i] = INF;
    }
    queue<int> q;
    q.push(1);
    inqueue[1] = true;
    nrimprove[1] = 1;
    while(!q.empty()) {
        int now = q.front();
        q.pop();
        inqueue[now] = false;
        for(muchie mu : graf[now]) {
            if(cost[now] + mu.cost < cost[mu.dest]) {
                cost[mu.dest] = cost[now] + mu.cost;
                nrimprove[mu.dest]++;
                if(nrimprove[mu.dest] > n) {
                    cout << "Ciclu negativ!";
                    return 0;
                }
                if(!inqueue[mu.dest]) {
                    q.push(mu.dest);
                    inqueue[mu.dest] = true;
                }
            }
        }
    }
    for(int i = 2; i <= n; i++) {
        cout << cost[i] << ' ';
    }
    return 0;
}