Bernard Wong
  • Software Engineer
  • Problems
    • Lowest Common Ancestor of a Binary Tree
    • Longest Substring Without Repeating Characters
    • Longest Palindromic Substring
    • Longest Common Prefix
    • Isomorphic Strings
    • Integer to Roman
    • Frog Jump
    • Find the Difference
    • Find k closest elements to a given value
    • Longest Common Subsequence
    • Binary Search Tree from Sorted Array
    • Balanced Binary Tree
    • Sort Using Two Stacks
    • O(1) Stack
    • k-th element to last of a LinkedList
    • Dedup LinkedList
    • Check Rotated String
    • Compress String by Character Count
    • Escape HTML whitespace
    • Check String Permutation
    • Unique String
    • Container With Most Water
    • 4 Sum
    • 3 Sum Closest
    • 3 Sum
    • 2 Sum
    • Maximum Subarray
    • Nested List Weight Sum
    • Palindrome Number
    • Pow(x, n)
    • Regular Expression Matching
    • Remove Nth Node From End of List
    • Reverse Integer
    • Roman to Integer
    • Rotate Array
    • Search a 2D Matrix
    • Shortest Word Distance
    • Two Sum III - Data structure design
    • Valid Parentheses
    • ZigZag Conversion
    • Quicksort
    • Add Two Numbers
    • Best Time to Buy and Sell Stock
    • Letter Combinations of a Phone Number
  • Data Structures
    • Heap
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  1. Problems

Longest Common Prefix

Write a function to find the longest common prefix string amongst an array of strings.

def longestCommonPrefix(strs: Array[String]):String = {
  if (strs.length == 0) ""
  else {
    strs.reduceRight((s1,s2) => {
      val l = s1.length min s2.length
      var i = 0
      while (i < l && s1(i) == s2(i)) {
        i += 1
      }
      s1.take(i)
    })
  }
}

longestCommonPrefix(Array())
longestCommonPrefix(Array("a"))
longestCommonPrefix(Array("abc","abcdef","abpoiuyt"))

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Last updated 6 years ago