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Copy pathSparseSet.py
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74 lines (45 loc) · 1.5 KB
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class SparseSet1:
def __init__(self, capacity=10, maxVal=10):
self.dense = [0] * capacity
self.sparse = [0] * (maxVal + 1)
self.capacity = capacity
self.maxVal = maxVal
self.items = 0
def add(self, item):
if item > self.maxVal or self.items >= self.capacity or self.index(item) != -1:
return
self.dense[self.items] = item
self.sparse[item] = self.items
self.items += 1
def remove(self, item):
if self.index(item) == -1:
return
temp = self.dense[self.items - 1]
self.dense[self.sparse[item]] = temp
self.sparse[temp] = self.sparse[item]
self.items -= 1
def index(self, item):
if item <= self.maxVal and self.sparse[item] < self.items and self.dense[self.sparse[item]] == item:
return self.sparse[item]
return -1
def clear(self):
self.items = 0
def main():
for sparse_set_class in [SparseSet1]:
sparse_set = sparse_set_class()
sparse_set.add(2);
sparse_set.add(4);
print(sparse_set.index(4));
print(sparse_set.index(6));
sparse_set.add(6);
sparse_set.add(8);
print(sparse_set.index(6));
sparse_set.remove(6);
print(sparse_set.index(6));
print(sparse_set.index(8));
sparse_set.clear();
print(sparse_set.index(2));
print(sparse_set.index(8));
print("------")
if __name__ == '__main__':
main()