Number of Lines To Write String in Python

Suppose we have a string S and we have to write the letters of that given string, from left to right into lines. Here each line has maximum width 100 units, and if writing a letter would cause the width of the line to exceed 100 units, that will be written on the next line. We also have an array widths, here widths[0] is the width of 'a', widths[1] is the width of 'b'and so on.

We have to find the answers of two questions −

  • How many lines have at least one character from S
  • What is the width used by the last such line?

We will return the answer as an integer list of length 2.

So, if the input is like [4,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10] and S = "bbbcccdddaaa", then the output will be [2, 4], as all letters except 'a' have the same length of 10, and the string "bbbcccdddaa" will cover 9 * 10 + 2 * 4 = 98 spaces. For the last 'a', it is written on the second line because there is only 2 units left in the first line. So the answer is 2 lines, plus 4 units in the second line.

To solve this, we will follow these steps −

  • line := 1, count := 0
  • for each i in S, do
    • count := count + widths[ASCII of i - 97]
    • if count > 100, then
      • line := line + 1
      • count := widths[ASCII of i - 97]
  • return [line, count]

Let us see the following implementation to get better understanding −


 Live Demo

class Solution:
   def numberOfLines(self, widths, S):
      line = 1
      count = 0
      for i in S:
         count += widths[ord(str(i))-97]
      if count > 100:
         line += 1
      count = widths[ord(str(i))-97]
   return [line, count]
ob = Solution()
print(ob.numberOfLines([4,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10], "bbbcccdddaaa"))




[2, 4]

Updated on: 04-Jul-2020


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