You are given a 0-indexed string array words.
Let's define a boolean function isPrefixAndSuffix that takes two strings, str1 and str2:
isPrefixAndSuffix(str1, str2) returns true if str1 is both a prefix and a suffix of str2, and false otherwise.For example, isPrefixAndSuffix("aba", "ababa") is true because "aba" is a prefix of "ababa" and also a suffix, but isPrefixAndSuffix("abc", "abcd") is false.
Return an integer denoting the number of index pairs (i, j) such that i < j, and isPrefixAndSuffix(words[i], words[j]) is true.
\n
Example 1:
\n\n\nInput: words = ["a","aba","ababa","aa"]\nOutput: 4\nExplanation: In this example, the counted index pairs are:\ni = 0 and j = 1 because isPrefixAndSuffix("a", "aba") is true.\ni = 0 and j = 2 because isPrefixAndSuffix("a", "ababa") is true.\ni = 0 and j = 3 because isPrefixAndSuffix("a", "aa") is true.\ni = 1 and j = 2 because isPrefixAndSuffix("aba", "ababa") is true.\nTherefore, the answer is 4.\n\nExample 2:
\n\n\nInput: words = ["pa","papa","ma","mama"]\nOutput: 2\nExplanation: In this example, the counted index pairs are:\ni = 0 and j = 1 because isPrefixAndSuffix("pa", "papa") is true.\ni = 2 and j = 3 because isPrefixAndSuffix("ma", "mama") is true.\nTherefore, the answer is 2. \n\nExample 3:
\n\n\nInput: words = ["abab","ab"]\nOutput: 0\nExplanation: In this example, the only valid index pair is i = 0 and j = 1, and isPrefixAndSuffix("abab", "ab") is false.\nTherefore, the answer is 0.\n\n\n
Constraints:
\n\n1 <= words.length <= 501 <= words[i].length <= 10words[i] consists only of lowercase English letters.(i, j), such that i < j, and check isPrefixAndSuffix(words[i], words[j]).",
"The answer is the total number of pairs where isPrefixAndSuffix(words[i], words[j]) == true."
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