Cod sursa(job #2574873)

Utilizator petrisorvmyVamanu Petru Gabriel petrisorvmy Data 6 martie 2020 10:24:23
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.6 kb
#include <bits/stdc++.h>
#define FILE_NAME "dijkstra"
#define fast ios_base :: sync_with_stdio(0); cin.tie(0);
#pragma GCC optimize("O3")
#define NMAX 50000 + 100
using namespace std;

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

typedef long long ll;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> llp;
typedef pair<ld,ld> pct;

const int inf = 1 << 30;
const ll mod = 1e9 + 7;
const ld eps = 1e-9;


void add(ll &a , ll b)
{
    a += b;
    a %= mod;
}

void sub(ll &a, ll b)
{
    a = (a - b + mod) % mod;
}

int n, m, dist[NMAX], x, y, z;
vector <pi> G[NMAX];
///Incercare cu priority queue
void Dijkstra(int start)
{
    priority_queue<pi, vector<pi>, greater<pi> > Q;
    for(int i = 1; i <= n; ++i)
        dist[i] = inf;
    dist[start] = 0;
    Q.push({0,start});
    while(!Q.empty())
    {
        int nod = Q.top().second;
        Q.pop();
        for(auto it : G[nod])
        {
            int urm = it.first;
            int cost = it.second;
            if(dist[urm] > dist[nod] + cost)
            {
                dist[urm] = dist[nod] + cost;
                Q.push({dist[urm], urm});
            }
        }
    }
    for(int i = 1; i <= n; ++i)
        if(i != start)
        {
            if(dist[i] != inf)
                g << dist[i] << ' ';
            else
                g << 0 << ' ';
        }
}
int main()
{
    f >> n >> m;
    for(int i = 1; i <= m; ++i)
    {
        f >> x >> y >> z;
        G[x].push_back({y,z});
    }
    Dijkstra(1);
    f.close();
    g.close();
    return 0;
}