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Javascript 1.8 easy (48 chars) function f(s)(s.match(/[^a-z0-9]/gi)||[]).length

Task Make a complete program or a function which calculates sum of all temperatures which, when written in Celsius and Fahrenheit scale, are anagram of each other. Description For example, 275 …

Knapsack Problem (Actually, this is a subset of real knapsack problem.... - there's nothing to optimize!) The knapsack problem is: Given positive integers , and an integer S, find non-negative i …

Python (13 chars, Difference: 9^(9^9) (369,693,100 digits!)) a=0;a=9**9**9 I believe that the result of this operation is not a float, isn't it? If that's problem because it doesn't yield the resu …

ActionScript3 (53) Using Newton's method. (Hooray 4 IEEE 754) function s(b,d=2){return b==d*d?d:s(b,d-(d*d-b)/2/d)} I know I'm TOO late but I just wanted to write something I did :(

Javascript, 93 89 78 77 chars function x(){Date().match("c 25")?alert("It's Christmas"):setTimeout(x,1)}x()

Dart to HTML, 135 134-1 = 133 main(){for(var s="Hello World",i=0;i<11;print("<font color=#${'F00F60FB0FF06F00F00B606B00F60F90F'.substring(i*3,i*3+3)}>${s[i++]}"));} Is there any way to color texts w …

Challenge Write a function which takes an argument which is a verb, and returns the past tense of the verb. (Assume that the verb is regular) Past tense Note: consider y as neither consonant no …

Another date-manipulating problem :P Task Write a program or a function that calculates the difference between two dates given by a user. Input & Output Similar to the previous one, inputs are …

Write a simple program that copies itself when executed. Your program should be some kind of executable file on Windows, Linux, etc.., should generate new executable file, which is identical to your …

Task Make a simple IRC bot which does simple task like greeting user. Detail (You may see this RFC document.) Write a complete program that perform these: The program inputs nickname and realname f …

Task Write a program or a function that calculates a week-day name of a date which a user inputs. Input & Output Input is a string, YYYYMMDD. Example of input values: 20110617 : June 17, 2011 19 …

Python, 161 159 166 140 141 134 132 chars y=raw_input();i=n=l=len(y) while i: if (y[:i]*l)[:l]==y:n=i i-=1 x=y[:n];y=x*2 while i<n: x=min(x,y[i:i+n]) i+=1 print x EDIT : Golfed the code after r …

Brainfuck - 446 (441 if omit >>>>>. which prints \n) ++++++++[>++++++>>++++>>>-------->+>++++<<<<<<<<-]>-[->+>>++>++> ++++<<<<<]>>.....>+......>>>++.<<<<....<.>......>>--.>>.>...<<.< <<.<.>>>.<<..<.> …

JS - 154 146 chars function f(x){var a=[],m;(m=x.length)>1?f(x.slice(1)).map(function(y){for(l=m;l--;a.push(y.slice(0,l).concat(x[0],y.slice(l))));}):a=[x];return a} Test : f([1,2,3,4,5]).map(functi …