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Challenges with a spec which requires all answers to meet certain time complexity restrictions. This could be specific ("Your answer must be O(n^2) where n is the number of items in the input"), or at the level of complexity classes ("Your answer must be polynomial in the number of items in the input").

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Find the positive divisors!

C#, 87 bytes Golfed String m(int v){var o="1";int i=1;while(++i<=v/2)if(v%i==0)o+=","+i;o+=","+v;return o;} Ungolfed String m( Int32 v ) { String o = "1"; Int32 i = 1; while (++i <= v …
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