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String Theory...not quite (Posted on 2010-07-27) Difficulty: 3 of 5
If the numbers 1 - 100 are written in one long string, how many substrings of minimum length 2 can be found with strictly decreasing numbers? e.g. 12345678910 has three such substrings: 91, 910, 10.

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Strings unstrung - solution | Comment 1 of 6
I find 90 such substrings, ending with 98, 91, 910, 10.
  Posted by ed bottemiller on 2010-07-27 12:12:21
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