floyd warshall algorithm python

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Mads
15 Jan 2017
1# Number of vertices
2nV = 4
3INF = 999
4
5# Algorithm 
6def floyd(G):
7    dist = list(map(lambda p: list(map(lambda q: q, p)), G))
8
9    # Adding vertices individually
10    for r in range(nV):
11        for p in range(nV):
12            for q in range(nV):
13                dist[p][q] = min(dist[p][q], dist[p][r] + dist[r][q])
14    sol(dist)
15
16# Printing the output
17def sol(dist):
18    for p in range(nV):
19        for q in range(nV):
20            if(dist[p][q] == INF):
21                print("INF", end=" ")
22            else:
23                print(dist[p][q], end="  ")
24        print(" ")
25
26G = [[0, 5, INF, INF],
27         [50, 0, 15, 5],
28         [30, INF, 0, 15],
29         [15, INF, 5, 0]]
30floyd(G)
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