How to Solve Sum of Largest Prime Substrings Problem
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Sum of Largest Prime Substrings
Given a string s, find the sum of the 3 largest unique prime numbers that can be formed using any of its substrings. Return the sum of the three largest unique prime numbers that can be formed. If few...
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Understanding the Sum of Largest Prime Substrings Problem
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Problem Statement
Given a string s, find the sum of the 3 largest unique prime numbers that can be formed using any of its substrings. Return the sum of the three largest unique prime numbers that can be formed. If fewer than three exist, return the sum of all available primes. If no prime numbers can be formed, return 0. Note: Each prime number should be counted only once, even if it appears in multiple substrings. Additionally, when converting a substring to an integer, any leading zeros are ignored.
Sum of Largest Prime Substrings
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Examples
s = "12234"1469The unique prime numbers formed from the substrings of "12234" are 2, 3, 23, 223, and 1223. The 3 largest primes are 1223, 223, and 23. Their sum is 1469.
s = "111"11The unique prime number formed from the substrings of "111" is 11. Since there is only one prime number, the sum is 11.
Constraints
1 <= s.length <= 10s consists of only digits.How Interview Coder Helps with Leetcode Problems
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