Question

How to find the smallest missing number from sorted list in Python

Answer 1

def findSmallestMissingNumber(lst) :
    min = lst[0]
    size = len(lst)
    i = 1
    while (i < size) :
        if (lst[i] > min + 1) :
            return min + 1
        else :
            min = lst[i]
        i += 1
        
    return -1
        
lst = [18, 19, 20, 27, 33, 36, 40, 42]

print(findSmallestMissingNumber(lst), end ="")




'''
run:

21

'''

 

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