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12_simple_mode.py
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12_simple_mode.py
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# Using the Python language, have the function SimpleMode(arr) take the array of numbers stored in arr and return the
# number that appears most frequently (the mode). For example: if arr contains [10, 4, 5, 2, 4] the output should be 4.
# If there is more than one mode return the one that appeared in the array first (ie. [5, 10, 10, 6, 5] should return 5
# because it appeared first). If there is no mode return -1. The array will not be empty.
def make_histogram(an_array):
histogram = {}
for num in an_array:
histogram[num] = histogram.get(num, 0) + 1
return histogram
def SimpleMode(an_array):
histogram = make_histogram(an_array)
maximum = max(histogram.values())
if maximum == 1:
return -1
maxes = []
for key in histogram.keys():
if histogram[key] == maximum:
maxes.append(key)
for num in an_array:
if num in maxes:
return num