Notes
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class LRUCache:
# store keys of cache
def __init__(self, n):
self.csize = n
self.dq = []
self.ma = {}
# Refers key x with in the LRU cache
def refer(self, x):
# not present in cache
if x not in self.ma.keys():
# cache is full
if len(self.dq) == self.csize:
# delete least recently used element
last = self.dq[-1]
# Pops the last element
ele = self.dq.pop();
# Erase the last
del self.ma[last]
# present in cache
else:
del self.dq[self.ma[x]]
# update reference
self.dq.insert(0, x)
self.ma[x] = 0;
# Function to display contents of cache
def display(self):
# Iterate in the deque and print
# all the elements in it
print(self.dq)
# Driver Code
ca = LRUCache(4)
ca.refer(1)
ca.refer(2)
ca.refer(3)
ca.refer(1)
ca.refer(4)
ca.refer(5)
ca.display()
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