Cod sursa(job #3252637)

Utilizator stefanvoicaVoica Stefan stefanvoica Data 30 octombrie 2024 13:25:07
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.92 kb
#include <fstream>
#include <iomanip>
#define MAX 2e9

using namespace std;

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

int n, p, x, y, c, i, j, mn, poz;
int a[1602][1602], d[1602];
bool viz[1602];

int main()
{
    f >> n >> p;
    for(i = 1; i <= n; i ++)
        for(j = 1; j <= n; j ++) if(i != j) a[i][j] = MAX;

    while(f >> x >> y >> c) a[x][y] = c;
    viz[p] = 1;
    for(i = 1; i <= n; i ++) d[i] = a[p][i];

    for(i = 1; i <= n - 1; i ++)
    {
        mn = 2e9;
        for(j = 1; j <= n; j ++)
            if(!viz[j] && d[j] < mn)
            {
                poz = j;
                mn = d[j];
            }

        viz[poz] = 1;
        for(j = 1; j <= n; j ++)
            if(!viz[j] && d[j] > d[poz] + a[poz][j]) d[j] = a[poz][j] + d[poz];
    }

    for(i = 1; i <= n; i ++)
        if(d[i] != MAX) g << d[i] << ' ';
        else g << -1 << ' ';

    return 0;
}