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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
199087 changed files with 3378941 additions and 0 deletions
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19
Task/Dijkstras-algorithm/PARI-GP/dijkstras-algorithm.parigp Normal file
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shortestPath(G, startAt=1)={
my(n=#G[,1],dist=vector(n,i,9e99),prev=dist,Q=2^n-1);
dist[startAt]=0;
while(Q,
my(t=vecmin(vecextract(dist,Q)),u);
if(t==9e99, break);
for(i=1,#v,if(dist[i]==t && bittest(Q,i-1), u=i; break));
Q-=1<<(u-1);
for(i=1,n,
if(!G[u,i],next);
my(alt=dist[u]+G[u,i]);
if (alt < dist[i],
dist[i]=alt;
prev[i]=u;
)
)
);
dist
};