35 lines
763 B
Python
35 lines
763 B
Python
"""
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Sum of primes below 2 million
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"""
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import time
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def timer(func):
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def wrapper(*args, **kwargs):
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start = time.time()
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result = func(*args, **kwargs)
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end = time.time()
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print(f"{func.__name__} took {end - start:.6f} seconds")
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return result
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return wrapper
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def sieve_primes(max: int) -> list[int]:
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primes = [True] * (max + 1)
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primes[0:2] = [False, False]
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for i in range(2, max + 1):
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if primes[i]:
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primes[i * i : max : i] = [False] * ((max - 1 - i * i) // i + 1)
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return [i for i in range(max) if primes[i]]
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@timer
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def sum_primes(max: int) -> int:
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return sum(sieve_primes(max))
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if __name__ == "__main__":
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print(sum_primes(2_000_000))
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