Cod sursa(job #2912159)

Utilizator raul41917raul rotar raul41917 Data 7 iulie 2022 10:05:36
Problema Floyd-Warshall/Roy-Floyd Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.3 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#define INF 1000000000
using namespace std;
ifstream fi("royfloyd.in");
ofstream fo("royfloyd.out");
int N;
int M[101][101];
int MD[101][101];
int D[101];
vector <int>V[101];
queue<int>coada;
void BFS()
{
    while(!coada.empty())
    {
        int x=coada.front();
        coada.pop();
        for(int i=0;i<V[x].size();i++)
        {
            int vecin=V[x][i];
            if(D[vecin]>D[x]+M[x][vecin])
            {
                D[vecin]=D[x]+M[x][vecin];
                coada.push(vecin);
            }
        }
    }
}
int main()
{
    fi>>N;
    for(int i=1;i<=N;i++)
        for(int j=1;j<=N;j++)
        {
            fi>>M[i][j];
            if(i!=j && M[i][j]!=0)
                V[i].push_back(j);
        }
    for(int  i=1;i<=N;i++)
    {
        ///Source node i
        for(int j=1;j<=N;j++)
            D[j]=INF;
        D[i]=0;
        coada.push(i);
        BFS();
        for(int j=1;j<=N;j++)
        {
            if(D[j]==0 || D[j]==INF)
                MD[i][j]=0;
            else
                MD[i][j]=D[j];
        }
    }
    for(int i=1;i<=N;i++)
    {
        for(int j=1;j<=N;j++)
            fo<<MD[i][j]<<" ";
        fo<<"\n";
    }
    return 0;
}