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837
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1 #!/usr/bin/env python
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2
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3 """
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4 given a `value` and an array,
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5 if the sum of two numbers in the array
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6 total the value, return `True`
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7 (exit 0):
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8
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9 ./array_sum.py 3 1 2 4 # YES! because 1+2=3
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10
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11 ./array_sum.py 4 1 2 5 6 # NO!
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12 """
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13
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14 import argparse
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15 import sys
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16
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17
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18 def sum_of_two(value, *array):
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19
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20 start = 0
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21 end = len(array) - 1
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22 complements = []
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23 while start < end:
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24 start_val = array[start]
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25 end_val = array[end]
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26 _sum = start_val + end_val
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27 if _sum == value:
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28 complements.append((start_val, end_val))
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29 end -= 1
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30 start +=1
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31 continue
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32 if _sum > value:
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33 end -= 1
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34 else:
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35 start += 1
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36 return complements
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37
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38
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39 def main(args=sys.argv[1:]):
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40
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41 parser = argparse.ArgumentParser(description=__doc__)
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42 parser.add_argument('value', type=int)
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43 parser.add_argument('array', type=int, nargs='+')
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44 options = parser.parse_args(args)
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45
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46 retval = sum_of_two(options.value, *options.array)
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47
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48 print (retval)
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49
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50 sys.exit(0 if retval else 1)
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51
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52
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53 if __name__ == '__main__':
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54 main()
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