Cod sursa(job #2343943)

Utilizator Anastasia11Susciuc Anastasia Anastasia11 Data 14 februarie 2019 16:08:37
Problema Drumuri minime Scor 25
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 1.73 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#include <cmath>
#define Nmax 1505
#define INF 0x3f3f3f3f

using namespace std;

ifstream f("dmin.in");
ofstream g("dmin.out");

double EPS=1e-8;
double d[Nmax];
int cnt[Nmax];
bool in[Nmax];
struct cmp{
    bool operator()(int x, int y)
    {
        return d[x]>d[y];
    }
};

int n, m;
vector <pair <int, int> > v[Nmax];
priority_queue <int, vector <int>, cmp> Q;

void dijkstra(int start)
{
    for (int i = 1; i <= n; i++)
    {
        d[i]=INF;
    }
    cnt[1]=1;
    d[start]=0;
    in[start]=1;
    Q.push(start);
    while(!Q.empty())
    {
        int x=Q.top();
        in[x]=0;
        Q.pop();
        for (int i = 0; i < v[x].size(); i++)
        {
            int y=v[x][i].first;
            double c=v[x][i].second;
            c=log2(c);
            if(d[y]-d[x]-c>EPS)
            {
                cnt[y]=cnt[x];
                d[y]=d[x]+c;
                if(in[y] == 0)
                {
                    Q.push(y);
                    in[y]=1;
                }
            }
            else
            {
                if(abs(d[y]-d[x]-c)<EPS)
                {
                    cnt[y]+=cnt[x];
                    if(in[y] == 0)
                    {
                        Q.push(y);
                        in[y]=1;
                    }
                }
            }
        }
    }

    for (int i = 2; i <= n; i++) g << cnt[i] << " " ;

}

int main()
{
    f >> n >> m;
    for (int i = 1; i <= m; i++)
    {
        int x, y, c;
        f >> x >> y >> c;
        v[x].push_back({y, c});
        v[y].push_back({x, c});
    }

    dijkstra(1);

    return 0;
}