Cod sursa(job #1145233)

Utilizator jul123Iulia Duta jul123 Data 17 martie 2014 23:40:25
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.5 kb
#include<iostream>
#include<cstdio>
#define MAXIM 2147483647
#include<vector>
#include<queue>

using namespace std;

vector<pair<int, int> > a[50001];
queue<int>q;
int main()
{
    int i, j, prim, ultim, viz[50001], d[50001], nr[50001], x, y, c, n, m;
    FILE *fin, *fout;
    fin=fopen("bellmanford.in", "r");
    fout=fopen("bellmanford.out", "w");

    fscanf(fin, "%d %d", &n, &m);
    for(i=0; i<m; i++) {
        fscanf(fin, "%d %d %d", &x, &y, &c);
        a[x-1].push_back(make_pair(y-1, c));
    }
    for(i=0; i<n; i++) {
        d[i]=MAXIM;
        viz[i]=0;
        nr[i]=0;
    }
    q.push(0);
    viz[0]=1;
    d[0]=0;
    int ok=1;
    while(!q.empty() && ok==1) {
        for(i=0; i<a[q.front()].size(); i++)
            if(d[q.front()]<MAXIM)
            if(d[a[q.front()][i].first] > d[q.front()]+a[q.front()][i].second) {
                d[a[q.front()][i].first] = d[q.front()]+a[q.front()][i].second;
            if(viz[a[q.front()][i].first]==0) {
                if(nr[a[q.front()][i].first]>n)
                    ok=0;
                else {
                    q.push(a[q.front()][i].first);
                    viz[a[q.front()][i].first]=1;
                    nr[a[q.front()][i].first]++;
                    ultim++;

                }
            }

        }
        viz[q.front()]=0;
        q.pop();
    }
    if(ok==0)
        fprintf(fout, "Ciclu negativ!\n");
    else
        for(i=1; i<n; i++)
            fprintf(fout, "%d ",  d[i]);
}