mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-30 16:31:08 +00:00
59 lines
1.5 KiB
Python
59 lines
1.5 KiB
Python
def printDist(dist, V):
|
|
print("\nVertex Distance")
|
|
for i in range(V):
|
|
if dist[i] != float("inf"):
|
|
print(i, "\t", int(dist[i]), end="\t")
|
|
else:
|
|
print(i, "\t", "INF", end="\t")
|
|
print()
|
|
|
|
|
|
def minDist(mdist, vset, V):
|
|
minVal = float("inf")
|
|
minInd = -1
|
|
for i in range(V):
|
|
if (not vset[i]) and mdist[i] < minVal:
|
|
minInd = i
|
|
minVal = mdist[i]
|
|
return minInd
|
|
|
|
|
|
def Dijkstra(graph, V, src):
|
|
mdist = [float("inf") for i in range(V)]
|
|
vset = [False for i in range(V)]
|
|
mdist[src] = 0.0
|
|
|
|
for i in range(V - 1):
|
|
u = minDist(mdist, vset, V)
|
|
vset[u] = True
|
|
|
|
for v in range(V):
|
|
if (
|
|
(not vset[v])
|
|
and graph[u][v] != float("inf")
|
|
and mdist[u] + graph[u][v] < mdist[v]
|
|
):
|
|
mdist[v] = mdist[u] + graph[u][v]
|
|
|
|
printDist(mdist, V)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
V = int(input("Enter number of vertices: ").strip())
|
|
E = int(input("Enter number of edges: ").strip())
|
|
|
|
graph = [[float("inf") for i in range(V)] for j in range(V)]
|
|
|
|
for i in range(V):
|
|
graph[i][i] = 0.0
|
|
|
|
for i in range(E):
|
|
print("\nEdge ", i + 1)
|
|
src = int(input("Enter source:").strip())
|
|
dst = int(input("Enter destination:").strip())
|
|
weight = float(input("Enter weight:").strip())
|
|
graph[src][dst] = weight
|
|
|
|
gsrc = int(input("\nEnter shortest path source:").strip())
|
|
Dijkstra(graph, V, gsrc)
|