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ivanmmarkovicivanmmarkovic
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‎Ch05. Sorting and Searching/MapAbstractDataTypeChaining.py‎

Lines changed: 106 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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class HashTable:
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def __init__(self, size):
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self.keys = [None] * size
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self.values = [None] * size
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def put(self, key, value):
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hash = self.hash(key, len(self.keys))
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if self.keys[hash] == None:
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self.keys[hash] = [key]
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self.values[hash] = [value]
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else:
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self.keys[hash] = self.keys[hash] + [key]
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self.values[hash] =self.values[hash] + [value]
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def get(self, key):
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hash = self.hash(key, len(self.keys))
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if self.keys[hash] == None:
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return None
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else:
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ret_value = None
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found = False
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pos = 0
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while pos < len(self.keys[hash]) and not found:
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if self.keys[hash][pos] == key:
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ret_value = self.values[hash][pos]
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found = True
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else:
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pos += 1
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return ret_value
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def delete(self, key):
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ret_value = None
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hash = self.hash(key, len(self.keys))
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if self.keys[hash] == None:
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return ret_value
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else:
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found = False
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pos = 0
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while pos < len(self.keys[hash]) and not found:
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if self.keys[hash][pos] == key:
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found = True
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else:
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pos += 1
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if found:
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ret_value = self.values[hash][pos]
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self.keys[hash].pop(pos)
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self.values[hash].pop(pos)
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return ret_value
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def size(self):
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count = 0
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pos = 0
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while pos < len(self.keys):
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if self.keys[pos] != None:
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count += len(self.keys[pos])
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pos += 1
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return count
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def contains(self, key):
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hash = self.hash(key, len(self.keys))
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if self.keys[hash] == None:
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return False
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else:
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found = False
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pos = 0
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while pos < len(self.keys[hash]) and not found:
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if self.keys[hash][pos] == key:
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found = True
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else:
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pos += 1
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if found:
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return True
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else:
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return False
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def hash(self, item, size):
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return item % size
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def show(self):
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print(self.keys)
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print(self.values)
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ht = HashTable(11)
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print("put ##########################")
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ht.put(11, "11 - string")
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ht.put(22, "22 - string")
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ht.put(33, "33 - string")
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ht.put(44, "44 - string")
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ht.put(12, "12 - string")
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ht.put(10, "10 - string")
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print("size #########################", ht.size())
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print("contains #########################", ht.contains(33))
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print("get ##########################")
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print(ht.get(22), ht.get(33), ht.get(117))
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ht.show()
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print("delete ##########################")
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print(ht.delete(33), ht.delete(15))
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print(ht.get(22), ht.get(33), ht.get(117))
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print("size #########################", ht.size())
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print("contains #########################", ht.contains(33))
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ht.show()

‎Ch05. Sorting and Searching/MapAbstractDataTypeOpenAdressingLinearProbing.py‎

Lines changed: 122 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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1+
class HashTable:
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def __init__(self, size):
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self.keys = [None] * size
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self.values = [None] * size
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def put(self, key, value):
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hash = self.hash(key, len(self.keys))
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if self.keys[hash] == None:
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self.keys[hash] = key
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self.values[hash] = value
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elif self.keys[hash] == key:
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self.values[hash] = value
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else:
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new_hash = self.rehash(hash, len(self.keys))
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while new_hash != hash and self.keys[new_hash] != None and self.keys[new_hash] != key:
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new_hash = self.rehash(new_hash, len(self.keys))
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if self.keys[new_hash] == None:
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self.keys[new_hash] = key
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self.values[new_hash] = value
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elif self.keys[new_hash] == key:
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self.values[new_hash] = value
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def get(self, key):
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hash = self.hash(key, len(self.keys))
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if self.keys[hash] == None:
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return None
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elif self.keys[hash] == key:
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return self.values[hash]
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else:
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new_hash = self.rehash(hash, len(self.keys))
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while new_hash != hash and self.keys[new_hash] != None and self.keys[new_hash] != key:
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new_hash = self.rehash(new_hash, len(self.keys))
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if self.keys[new_hash] == None:
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return None
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elif self.keys[new_hash] == key:
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return self.values[new_hash]
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else:
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return None
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def delete(self, key):
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ret_value = None
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hash = self.hash(key, len(self.keys))
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if self.keys[hash] == key:
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ret_value =self.values[hash]
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self.keys[hash] = None
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self.values[hash] = None
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return ret_value
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elif self.keys[hash] == None:
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return ret_value
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else:
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new_hash = self.rehash(hash, len(self.keys))
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while new_hash != hash and self.keys[new_hash] != None and self.keys[new_hash] != key:
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new_hash = self.rehash(new_hash, len(self.keys))
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if self.keys[new_hash] == None:
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return ret_value
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elif self.keys[new_hash] == key:
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ret_value = self.values[new_hash]
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self.keys[new_hash] = None
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self.values[new_hash] = None
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return ret_value
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else:
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return ret_value
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def size(self):
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count = 0
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pos = 0
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while pos < len(self.keys):
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if self.keys[pos] != None:
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count += 1
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pos += 1
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return count
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def contains(self, key):
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hash = self.hash(key, len(self.keys))
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if self.keys[hash] == None:
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return False
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elif self.keys[hash] == key:
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return True
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else:
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new_hash = self.rehash(hash, len(self.keys))
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while new_hash != hash and self.keys[new_hash] != None and self.keys[new_hash] != key:
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new_hash = self.rehash(new_hash, len(self.keys))
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if self.keys[new_hash] == None:
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return False
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elif self.keys[new_hash] == key:
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return True
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else:
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return False
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def hash(self, item, size):
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return item % size
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def rehash(self, old_hash, size):
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return (old_hash + 1) % size
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def show(self):
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print(self.keys)
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print(self.values)
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ht = HashTable(11)
101+
print("put ##########################")
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ht.put(11, "11 - string")
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ht.put(22, "22 - string")
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ht.put(33, "33 - string")
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ht.put(44, "44 - string")
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ht.put(12, "12 - string")
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ht.put(10, "10 - string")
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print("size #########################", ht.size())
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print("contains #########################", ht.contains(33))
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print("get ##########################")
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print(ht.get(22), ht.get(33), ht.get(117))
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ht.show()
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print("delete ##########################")
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print(ht.delete(33), ht.delete(15))
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print(ht.get(22), ht.get(33), ht.get(117))
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print("size #########################", ht.size())
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print("contains #########################", ht.contains(33))
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ht.show()

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