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23 lines
455 B
Nim
23 lines
455 B
Nim
discard """
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output: "20365011074"
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"""
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import tables
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proc memoize(f: proc (a: int64): int64): proc (a: int64): int64 =
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var previous = initTable[int64, int64]()
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return proc(i: int64): int64 =
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if not previous.hasKey i:
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previous[i] = f(i)
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return previous[i]
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var fib: proc(a: int64): int64
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fib = memoize(proc (i: int64): int64 =
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if i == 0 or i == 1:
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return 1
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return fib(i-1) + fib(i-2)
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)
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echo fib(50)
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