64 lines
1.8 KiB
Python
64 lines
1.8 KiB
Python
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import sys
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import copy
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class FSA:
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def __init__(self):
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self.initial_state = '0'
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self.final_states = set()
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self.transitions = dict()
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self.alphabet = set()
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def add_transition(self, state_from, state_to, symbol):
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if state_from in self.transitions.keys():
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if symbol not in self.transitions[state_from].keys():
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self.transitions[state_from][symbol] = {state_to}
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else:
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self.transitions[state_from][symbol] |= {state_to}
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else:
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self.transitions[state_from] = dict()
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self.transitions[state_from][symbol] = {state_to}
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def add_final_state(self, state):
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self.final_states.add(state)
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def get_final_states(self, string):
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current_states = {self.initial_state}
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for symbol in string:
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new_current_states = set()
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for current_state in current_states:
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try:
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new_current_states |= self.transitions[current_state][symbol]
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except:
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pass
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current_states = copy.deepcopy(new_current_states)
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return current_states
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def accepts(self, string):
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for final_state in self.get_final_states(string):
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if final_state in self.final_states:
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return True
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return False
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fsa = FSA()
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table = open(sys.argv[1])
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for line in table:
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line = line.rstrip()
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if len(line.split('\t')) == 3:
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a, b, c = line.split('\t')
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fsa.add_transition(a, b, c)
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fsa.alphabet.add(c)
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else:
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fsa.add_final_state(line)
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for line in sys.stdin:
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line = line.rstrip()
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if fsa.accepts(line):
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print('YES')
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else:
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print('NO')
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