2018 Day 7
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Step C must be finished before step P can begin.
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Step V must be finished before step Q can begin.
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Step T must be finished before step X can begin.
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Step B must be finished before step U can begin.
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Step Z must be finished before step O can begin.
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Step P must be finished before step I can begin.
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Step D must be finished before step G can begin.
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Step A must be finished before step Y can begin.
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Step R must be finished before step O can begin.
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Step J must be finished before step E can begin.
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Step N must be finished before step S can begin.
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Step X must be finished before step H can begin.
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Step F must be finished before step L can begin.
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Step S must be finished before step I can begin.
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Step W must be finished before step Q can begin.
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Step H must be finished before step K can begin.
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Step K must be finished before step Q can begin.
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Step E must be finished before step L can begin.
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Step Q must be finished before step O can begin.
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Step U must be finished before step G can begin.
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Step L must be finished before step O can begin.
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Step Y must be finished before step G can begin.
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Step G must be finished before step I can begin.
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Step M must be finished before step I can begin.
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Step I must be finished before step O can begin.
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Step A must be finished before step N can begin.
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Step H must be finished before step O can begin.
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Step T must be finished before step O can begin.
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Step H must be finished before step U can begin.
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Step A must be finished before step I can begin.
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Step B must be finished before step R can begin.
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Step V must be finished before step T can begin.
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Step H must be finished before step M can begin.
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Step C must be finished before step A can begin.
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Step B must be finished before step G can begin.
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Step L must be finished before step Y can begin.
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Step T must be finished before step J can begin.
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Step A must be finished before step R can begin.
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Step X must be finished before step L can begin.
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Step B must be finished before step L can begin.
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Step A must be finished before step F can begin.
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Step K must be finished before step O can begin.
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Step W must be finished before step M can begin.
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Step Z must be finished before step N can begin.
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Step Z must be finished before step S can begin.
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Step R must be finished before step K can begin.
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Step Q must be finished before step L can begin.
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Step G must be finished before step O can begin.
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Step F must be finished before step Y can begin.
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Step V must be finished before step H can begin.
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Step E must be finished before step I can begin.
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Step W must be finished before step Y can begin.
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Step U must be finished before step I can begin.
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Step F must be finished before step K can begin.
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Step M must be finished before step O can begin.
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Step Z must be finished before step H can begin.
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Step X must be finished before step S can begin.
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Step J must be finished before step O can begin.
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Step B must be finished before step I can begin.
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Step F must be finished before step H can begin.
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Step D must be finished before step U can begin.
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Step E must be finished before step M can begin.
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Step Z must be finished before step X can begin.
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Step P must be finished before step L can begin.
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Step W must be finished before step H can begin.
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Step C must be finished before step D can begin.
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Step A must be finished before step X can begin.
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Step Q must be finished before step I can begin.
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Step R must be finished before step Y can begin.
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Step B must be finished before step A can begin.
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Step N must be finished before step L can begin.
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Step H must be finished before step G can begin.
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Step Y must be finished before step M can begin.
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Step L must be finished before step G can begin.
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Step G must be finished before step M can begin.
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Step Z must be finished before step R can begin.
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Step S must be finished before step Q can begin.
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Step P must be finished before step J can begin.
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Step V must be finished before step J can begin.
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Step J must be finished before step I can begin.
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Step J must be finished before step X can begin.
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Step W must be finished before step O can begin.
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Step B must be finished before step F can begin.
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Step R must be finished before step M can begin.
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Step V must be finished before step S can begin.
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Step H must be finished before step E can begin.
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Step E must be finished before step U can begin.
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Step R must be finished before step W can begin.
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Step X must be finished before step Q can begin.
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Step N must be finished before step G can begin.
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Step T must be finished before step I can begin.
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Step L must be finished before step M can begin.
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Step H must be finished before step I can begin.
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Step U must be finished before step M can begin.
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Step C must be finished before step H can begin.
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Step P must be finished before step H can begin.
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Step J must be finished before step F can begin.
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Step A must be finished before step O can begin.
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Step X must be finished before step M can begin.
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Step H must be finished before step L can begin.
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Step W must be finished before step K can begin.
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@ -0,0 +1,73 @@
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with open('day7-input', 'r') as file:
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data = [l.strip('\n') for l in file]
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steps = set()
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step_deps = {}
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for line in data:
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s = line.split()
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step1 = s[1]
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step2 = s[-3]
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steps.add(step1)
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steps.add(step2)
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if step2 in step_deps:
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step_deps[step2] += step1
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else:
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step_deps[step2] = [step1]
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queue = [step for step in steps]
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step_deps_1 = step_deps.copy()
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completed_steps = set()
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ready_steps = set()
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output = []
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while queue:
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for step in queue:
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if step not in step_deps_1:
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ready_steps.add(step)
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else:
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deps = [d for d in step_deps_1[step] if d not in completed_steps]
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if len(deps) > 0:
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step_deps_1[step] = deps
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else:
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ready_steps.add(step)
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step_deps_1.pop(step)
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for step in sorted(ready_steps)[:1]:
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completed_steps.add(step)
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output += step
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queue.remove(step)
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break
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ready_steps = set()
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print(''.join(output)) # Part 1
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unprocessed_steps = steps.copy()
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step_deps_2 = step_deps.copy()
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completed_steps_2 = set()
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ready_steps_2 = set()
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waiting_steps = {}
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time = 0
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while unprocessed_steps:
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for k in list(waiting_steps.keys()):
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waiting_steps[k] -= 1
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if waiting_steps[k] < 1:
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completed_steps_2.add(k)
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print(f'{time:04}: Step {k} complete!') # Debug
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waiting_steps.pop(k)
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for step in unprocessed_steps-ready_steps_2:
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if step not in step_deps_2:
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ready_steps_2.add(step)
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else:
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deps = [d for d in step_deps_2[step] if d not in completed_steps_2]
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if len(deps) > 0:
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step_deps_2[step] = deps
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else:
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ready_steps_2.add(step)
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step_deps_2.pop(step)
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for step in list(sorted(ready_steps_2)):
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if len(waiting_steps) >= 5: # Only 5 workers
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break
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waiting_steps[step] = 60 + ord(step)-64
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print(f'{time:04}: Starting step {step}! ({waiting_steps[step]} seconds remain)') # Debug
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unprocessed_steps.remove(step)
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ready_steps_2.remove(step)
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time += 1
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time += max(waiting_steps.values()) - 1 # t got moved forward 1 at end of while loop
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print(time) # Part 2
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