Google Interview Question for Software Engineers


Country: Korea
Interview Type: In-Person




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Level 1 linear search

def getCount(arr, num):
    return arr.count(num)

Level 2 binary search

def getCountSorted(arr, num):
    start, end = None, None
    s1, e1 = 0, len(arr) - 1
    while not start and s1 <= e1:
        mid = (s1 + e1) / 2
        if arr[mid] == num:
            if mid == 0 or arr[mid - 1] < 1:
                start = mid
            else:
                e1 = mid - 1
        elif arr[mid] > num:
            if mid == 0 or arr[mid - 1] < 1:
                return 0
            else:
                e1 = mid - 1
        else:
            s1 = mid + 1

    s2, e2 = s1, len(arr)
    while not end and s2 < e2:
        mid = (s2 + e2) / 2
        if arr[mid] == num:
            if mid == len(arr) - 1 or arr[mid + 1] > 1:
                end = mid + 1
            else:
                s2 = mid + 1
        else:
            e2 = mid
            
    return end - start

- aonecoding May 06, 2018 | Flag Reply


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