NPLFLA - Editorial

PROBLEM LINK:

Practice

Contest

Author: Harsh Shah

Tester: Aniket Marlapalle

Editorialist: Aniket Marlapalle

DIFFICULTY:

cakewalk

PREREQUISITES:

basic-programming

PROBLEM:

You start with an empty string, you need to create the number by using one of the following 2 operations:

  • You can append a digit d from 0 to 9 with a cost of d.
  • Append a sub-string of current string you have with a cost of 0.

EXPLANATION:

You can observe that once a digit is appended to your string it can be appended any number of times with a cost of 0 as it will be a sub-string of the current string.

So the total cost is just the sum of distinct digits present in the string.

AUTHOR’S AND TESTER’S SOLUTIONS:

Author’s solution can be found here

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