53 lines
1.4 KiB
Python
53 lines
1.4 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# IMPORTS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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from local.typing import *;
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# GLOBAL VARIABLES/CONSTANTS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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#
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# CLASS Queue
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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class Queue(object):
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_initialised: bool;
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values: List[int];
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def __init__(self):
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self._initialised = False;
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def INIT(self):
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self.values = [];
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self._initialised = True;
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def EMPTY(self) -> bool:
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return not self._initialised or len(self.values) == 0;
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def ENQUEUE(self, x: int):
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if not self._initialised:
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raise Exception('Queue not initialised!')
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self.values.append(x);
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def FRONT(self) -> int:
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if self.EMPTY():
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raise Exception('Cannot read from empty queue!')
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return self.values[0];
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def DEQUEUE(self) -> int:
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if self.EMPTY():
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raise Exception('Cannot remove from empty queue!')
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self.values = self.values[1:];
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def __str__(self) -> str:
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if len(self.values) == 0:
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return '-';
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return ', '.join([str(x) for x in self.values]);
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