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Cod sursa(job #525763)
/*for i = 1 to N
for j = 1 to N
if there is an edge from i to j
dist[0][i][j] = the length of the edge from i to j
else
dist[0][i][j] = INFINITY
for k = 1 to N
for i = 1 to N
for j = 1 to N
dist[k][i][j] = min(dist[k-1][i][j], dist[k-1][i][k] + dist[k-1][k][j])
*/
#include<stdio.h>
#define oo 1005
#define dim 105
using namespace std;
int A[dim][dim], dist[dim][dim][dim],i,j,k,n;
int minim(int a,int b)
{ if(a<b) return a;
return b;}
int main()
{
FILE *f=fopen("royfloyd.in","r"), *g=fopen("royfloyd.out","w");
fscanf(f,"%d",&n);
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
fscanf(f,"%d",&A[i][j]); //costul muchiei de i la j in graf
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
if(A[i][j])
dist[0][i][j]=A[i][j];
else dist[0][i][j]=oo;
for(k=1;k<=n;k++)
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
dist[k][i][j]=minim( dist[k-1][i][j], dist[k-1][i][k]+ dist[k-1][k][j]);
for(i=1;i<=n;i++)
dist[n][i][i]=0;
for(i=1;i<=n;i++)
{for(j=1;j<=n;j++)
fprintf(g,"%d ",dist[n][i][j]);
fprintf(g,"\n");}
fclose(f);
fclose(g);
return 0;
}