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1.py
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58 lines (47 loc) · 1.27 KB
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import sys
from collections import OrderedDict
class LRU:
def __init__(self, size: int):
self._dict = OrderedDict()
self._size = size
def get(self, key):
if key in self._dict:
self._dict.move_to_end(key, last=True)
return self._dict.get(key, None)
def put(self, key, value):
if key in self._dict:
self._dict.move_to_end(key, last=True)
elif len(self._dict) == self._size:
self._dict.popitem(last=False)
self._dict[key] = value
def _move_to_end_if_exists(self, key):
if key in self._dict:
self._dict.move_to_end(key, last=True)
def lcg(seed: int):
A = 1103515245
C = 12345
M = 1 << 31
while True:
seed = (A*seed + C) % M
yield seed
def main():
size = int(sys.argv[1]) if len(sys.argv) > 1 else 100
n = int(sys.argv[2]) if len(sys.argv) > 2 else 1000
mod = size * 10
rng0 = lcg(0)
rng1 = lcg(1)
hit = 0
missed = 0
lru = LRU(size)
for i in range(0, n):
n0 = next(rng0) % mod
lru.put(n0, n0)
n1 = next(rng1) % mod
if lru.get(n1) == None:
missed += 1
else:
hit += 1
print(hit)
print(missed)
if __name__ == '__main__':
main()