step: find oeis sequence starting with smth.
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index.md
11
index.md
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@ -3,6 +3,17 @@
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nimble install https://github.com/nim-lang/bigints
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https://nimdocs.com/nim-lang/bigints/bigints.html
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## Dependencies
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The data folder is not included, but its contents are:
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.
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├── data
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│ ├── stripped
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│ └── stripped.gz
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Where stripped.gz can be found at <https://oeis.org/wiki/JSON_Format,_Compressed_Files>
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## To do
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- [ ] Exploration of OEIS data
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@ -6,15 +6,30 @@ import bigints # type: BigInt
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let file_path = "./data/stripped"
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proc startsWithSubsequence(xs: seq[string], ys: seq[string]): bool =
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if xs.len == 0:
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return true
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elif ys.len == 0:
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return false
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elif xs[0] == ys[0]:
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return startsWithSubsequence(xs[1..<xs.len], ys[1..<ys.len])
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else:
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return false
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let f = open(file_path)
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var line : string
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var i = 0
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var start = @["1", "2", "3"]
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var seqs: seq[seq[string]]
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while f.read_line(line):
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if i > 3:
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let arr = split(line, ",")
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let l = arr.len
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let nums = arr[1..(l-2)] # .map(proc (x: string): BigInt = initBigInt(x))
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# echo nums
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let seq = split(line, ",")
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let l = seq.len
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let nums = seq[1..(l-2)] # .map(proc (x: string): BigInt = initBigInt(x))
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if startsWithSubsequence(start, nums):
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seqs.add(nums)
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i = i + 1
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f.close()
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echo seqs
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1
scratchpad/seqs.nim
Normal file
1
scratchpad/seqs.nim
Normal file
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@ -0,0 +1 @@
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echo @[ "1", "2" ] in @["1", "2", "3" ]
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