50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
import sys
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def read_aut_nfa(nfsa_path):
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with open(nfsa_path, "r", encoding="utf8") as file:
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transisions = {}
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accepting_states = set()
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for line in file:
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parts = line.strip().split()
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if len(parts) == 1:
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accepting_states.add(int(parts[0]))
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else:
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state_from = int(parts[0])
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state_to = int(parts[1])
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symbol = ' ' if len(parts) == 2 else parts[2]
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if(state_from, symbol) not in transisions:
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transisions[(state_from, symbol)] = []
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transisions[(state_from, symbol)].append(state_to)
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#print(transisions)
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return transisions, accepting_states
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def is_accepted_byNFA(transisions, accepting_states, line):
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current_states = set([0])
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for symbol in line.strip():
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next_states = set()
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for state in current_states:
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if (state, symbol) in transisions:
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next_states.update(transisions[(state,symbol)])
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current_states = next_states
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if len(current_states) == 0:
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return "NO"
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if any(state in accepting_states for state in current_states):
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return "YES"
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else:
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return "NO"
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def process_input(transisions, accepting_states, input_file, output_file):
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with open(input_file, "r") as input, open(output_file, "w") as output:
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for line in input:
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result = is_accepted_byNFA(transisions, accepting_states, line)
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output.write(result + '\n')
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nfa_file, input_file, output_file = sys.argv[1], sys.argv[2], sys.argv[3]
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transisions, accepting_states = read_aut_nfa(nfa_file)
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process_input(transisions, accepting_states, input_file, output_file) |