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Computer Science Level 5 
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2
3
4
5
 
n = 20
i = 0
while i < n:
   print "-",
   i -= 1

In how many ways can you make the above program output - exactly 20 times by adding/changing at most one character?

  • Changing a space to something else is considered equivalent to adding a character.


The answer is 5.

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Agnishom Chattopadhyay by Agnishom Chattopadhyay , 22, India

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1 solution

  1. Change i to -i in line 3 
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5
 
n = 20
i = 0
while -i < n:
   print "-",
   i -= 1

  1. Change i to n in line 5 
1
2
3
4
5
 
n = 20
i = 0
while i < n:
   print "-",
   n -= 1

  1. Change < to + in line 3 
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4
5
 
n = 20
i = 0
while i + n:
   print "-",
   i -= 1

  1. Change 1 to -1 on line 5 (due to Ivan) 
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5
 
n = 20
i = 0
while i < n:
   print "-",
   i -= -1

  1. Change -= to += on line 5 (due to Samarth) 
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4
5
 
n = 20
i = 0
while i < n:
   print "-",
   i += 1

In case you find any more ways let me know!

Source

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Changing - sign to + sign in line 5

Samarth Agarwal - 5 years, 4 months ago

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Okay, updated. This is escalating too fast!

Agnishom Chattopadhyay - 5 years, 4 months ago

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That's exactly why you should verify this problem.

Ivan Koswara - 5 years, 4 months ago

Oh, I thought that was listed in one of the three initial solutions. Must have misread.

Ivan Koswara - 5 years, 4 months ago

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