Cod sursa(job #1445603)

Utilizator Burbon13Burbon13 Burbon13 Data 30 mai 2015 15:46:00
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.47 kb
#include <iostream>
#include <cstdio>
#include <vector>
#include <queue>
#include <cstring>
#include <cstdlib>
using namespace std;

const int nmx = 50005, inf = 0x3f3f3f3f;

int n, dist[nmx], nr_vizite[nmx];
vector <pair <int,int> > g[nmx];

inline void citire() {
    int m, nod1, nod2, cost;
    scanf("%d %d", &n, &m);
    for(; m; --m) {
        scanf("%d %d %d", &nod1, &nod2, &cost);
        g[nod1].push_back(make_pair(nod2,cost)); /// pereche ( nod , cost )
    }
}

inline void bellmanford() {
    memset(dist, inf, sizeof(dist));
    dist[1] = 0;
    queue <int> q;
    q.push(1);
    int nod_curent, nr_vecini;
    while(not q.empty()) {
        nod_curent = q.front();
        q.pop();
        nr_vecini = g[nod_curent].size();
        for(int i = 0; i < nr_vecini; ++i)
            if(dist[g[nod_curent][i].first] > dist[nod_curent] + g[nod_curent][i].second) {
                dist[g[nod_curent][i].first] = dist[nod_curent] + g[nod_curent][i].second;
                q.push(g[nod_curent][i].first);
                if(++ nr_vizite[g[nod_curent][i].first] > n){
                    printf("Ciclu negativ!\n");
                    exit(0);
                }
            }
    }
}

inline void afish(){
    for(int i = 2; i <= n; ++i)
        printf("%d ", dist[i]);
}

int main() {
    freopen("bellmanford.in", "r", stdin);
    freopen("bellmanford.out", "w", stdout);
    citire();
    bellmanford();
    afish();
    return 0;
}