# # find the missing number in an array # input = [1,2,3,4,5,6,7,8,9, 10,11,12,13,14,15,16,17,18,19, 20,21,22,23,24,25,26,27,28,29, 30,31,32,33,34,35,36,37,38,39, 40,41,42,43,44,45,46,47,48,49, 50,51,52,53,54,56,57,58,59, 60,61,62,63,64,65,66,67,68,69, 70,71,72,73,74,75,76,77,78,79, 80,81,82,83,84,85,86,87,88,89, 90,91,92,93,94,95,96,97,98,99,100] def findMissing(numArray, maxNum): toReturn = -1 numDict = {} for num in numArray: numDict[num] = 1 found = False i = 1 while (i <= maxNum and not found): if not numDict.get(i): found = True toReturn = i else: i += 1 return toReturn print findMissing(input, 100)
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