Class Solution
Easy
You are given a 0-indexed array words
consisting of distinct strings.
The string words[i]
can be paired with the string words[j]
if:
- The string
words[i]
is equal to the reversed string ofwords[j]
. 0 <= i < j < words.length
.
Return the maximum number of pairs that can be formed from the array words
.
Note that each string can belong in at most one pair.
Example 1:
Input: words = [“cd”,“ac”,“dc”,“ca”,“zz”]
Output: 2
Explanation: In this example, we can form 2 pair of strings in the following way:
- We pair the 0th string with the 2nd string, as the reversed string of word[0] is “dc” and is equal to words[2].
- We pair the 1st string with the 3rd string, as the reversed string of word[1] is “ca” and is equal to words[3].
It can be proven that 2 is the maximum number of pairs that can be formed.
Example 2:
Input: words = [“ab”,“ba”,“cc”]
Output: 1
Explanation: In this example, we can form 1 pair of strings in the following way:
- We pair the 0th string with the 1st string, as the reversed string of words[1] is “ab” and is equal to words[0].
It can be proven that 1 is the maximum number of pairs that can be formed.
Example 3:
Input: words = [“aa”,“ab”]
Output: 0
Explanation: In this example, we are unable to form any pair of strings.
Constraints:
1 <= words.length <= 50
words[i].length == 2
words
consists of distinct strings.words[i]
contains only lowercase English letters.
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Constructor Summary
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Method Summary
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Constructor Details
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Solution
public Solution()
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Method Details
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maximumNumberOfStringPairs
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