Package g2501_2600.s2515_shortest_distance_to_target_string_in_a_circular_array

Class Solution

java.lang.Object
g2501_2600.s2515_shortest_distance_to_target_string_in_a_circular_array.Solution
public class Solution extends java.lang.Object
2515 - Shortest Distance to Target String in a Circular Array.

Easy

You are given a 0-indexed circular string array words and a string target. A circular array means that the array’s end connects to the array’s beginning.

  • Formally, the next element of words[i] is words[(i + 1) % n] and the previous element of words[i] is words[(i - 1 + n) % n], where n is the length of words.

Starting from startIndex, you can move to either the next word or the previous word with 1 step at a time.

Return the shortest distance needed to reach the string target. If the string target does not exist in words, return -1.

Example 1:

Input: words = [“hello”,“i”,“am”,“leetcode”,“hello”], target = “hello”, startIndex = 1

Output: 1

Explanation: We start from index 1 and can reach “hello” by

  • moving 3 units to the right to reach index 4.

  • moving 2 units to the left to reach index 4.

  • moving 4 units to the right to reach index 0.

  • moving 1 unit to the left to reach index 0. The shortest distance to reach “hello” is 1.

Example 2:

Input: words = [“a”,“b”,“leetcode”], target = “leetcode”, startIndex = 0

Output: 1

Explanation: We start from index 0 and can reach “leetcode” by

  • moving 2 units to the right to reach index 3.

  • moving 1 unit to the left to reach index 3.

The shortest distance to reach “leetcode” is 1.

Example 3:

Input: words = [“i”,“eat”,“leetcode”], target = “ate”, startIndex = 0

Output: -1

Explanation: Since “ate” does not exist in words, we return -1.

Constraints:

  • 1 <= words.length <= 100
  • 1 <= words[i].length <= 100
  • words[i] and target consist of only lowercase English letters.
  • 0 <= startIndex < words.length

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    closetTarget(java.lang.String[] words, java.lang.String target, int startIndex)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • closetTarget

      public int closetTarget(java.lang.String[] words, java.lang.String target, int startIndex)