mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
beafe3656f
* Change some Image File names & re-code the psnr algorithm (conserving both methods). Also Added new example. * Selected psnr method and reformat some code from arithmetic_analysis
58 lines
1.2 KiB
Python
58 lines
1.2 KiB
Python
from __future__ import print_function
|
|
|
|
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)
|
|
|
|
|
|
|
|
#MAIN
|
|
V = int(input("Enter number of vertices: "))
|
|
E = int(input("Enter number of edges: "))
|
|
|
|
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:"))
|
|
dst = int(input("Enter destination:"))
|
|
weight = float(input("Enter weight:"))
|
|
graph[src][dst] = weight
|
|
|
|
gsrc = int(input("\nEnter shortest path source:"))
|
|
Dijkstra(graph, V, gsrc)
|