# find cycle in a weighted digraph
from GraphLib import EdgeWeightedDigraph
from DirectedEdge import DEdge # directed, weighted edge
# build an edge-weighted digraph
#with open('tinyEWDigraph.txt', 'r') as f:
with open('mediumEWDigraph.txt', 'r') as f:
V = int(f.readline().strip())
E = int(f.readline().strip())
text = f.read()
f.close()
#G = EdgeWeightedDigraph(V)
MG = EdgeWeightedDigraph(V)
lines = text.split('\n')
for line in lines[:-1]: # last line is empty
l = line.split()
v = int(l[0])
w = int(l[1])
weight = float(l[2])
#G.addEdge(DEdge(v, w, weight))
MG.addEdge(DEdge(v, w, weight))
#print G.E() == E
print MG.E() == E
from DirectedCycle import EdgeWeightedDC
finder = EdgeWeightedDC(MG)
if finder.hasCycle(): finder.cycle()
else:
print "no cycle"
# file format:
# N_jobs
# job_duration [list of successor jobs]
# ...
from GraphLib import EdgeWeightedDigraph
from DirectedEdge import DEdge
from LongestPath import AcyclicLP
with open('jobsPC_2.txt', 'r') as f:
#with open('jobsPC.txt', 'r') as f:
N = int(f.readline().strip()) # N is number of jobs to schedule
# build digraph to model job sequencing: 1 src, 1 target, each job has 2 vertices (start, end)
G = EdgeWeightedDigraph(N * 2 + 2)
src = 2 * N
sink = 2 * N + 1
lines = f.read().split('\n') # drop last line which is ''
f.close()
job = 0 # 'job' is job index
for line in lines:
fields = line.split() # split line on whitepace
duration = float(fields[0])
G.addEdge(DEdge(job, job + N,
duration)) # add edge betw 'start of job' and 'end of job'
G.addEdge(DEdge(src, job, 0))
G.addEdge(DEdge(job + N, sink, 0))
succ = map(int, fields[1:])
for w in succ:
# add precedence edges
G.addEdge(DEdge(job + N, w, 0))
job += 1
