You are given a 0-indexed string array words.
Two strings are similar if they consist of the same characters.
\n\n"abca" and "cba" are similar since both consist of characters 'a', 'b', and 'c'."abacba" and "bcfd" are not similar since they do not consist of the same characters.Return the number of pairs (i, j) such that 0 <= i < j <= word.length - 1 and the two strings words[i] and words[j] are similar.
\n
Example 1:
\n\n\nInput: words = ["aba","aabb","abcd","bac","aabc"]\nOutput: 2\nExplanation: There are 2 pairs that satisfy the conditions:\n- i = 0 and j = 1 : both words[0] and words[1] only consist of characters 'a' and 'b'. \n- i = 3 and j = 4 : both words[3] and words[4] only consist of characters 'a', 'b', and 'c'. \n\n\n
Example 2:
\n\n\nInput: words = ["aabb","ab","ba"]\nOutput: 3\nExplanation: There are 3 pairs that satisfy the conditions:\n- i = 0 and j = 1 : both words[0] and words[1] only consist of characters 'a' and 'b'. \n- i = 0 and j = 2 : both words[0] and words[2] only consist of characters 'a' and 'b'.\n- i = 1 and j = 2 : both words[1] and words[2] only consist of characters 'a' and 'b'.\n\n\n
Example 3:
\n\n\nInput: words = ["nba","cba","dba"]\nOutput: 0\nExplanation: Since there does not exist any pair that satisfies the conditions, we return 0.\n\n
\n
Constraints:
\n\n1 <= words.length <= 1001 <= words[i].length <= 100words[i] consist of only lowercase English letters.给你一个下标从 0 开始的字符串数组 words 。
如果两个字符串由相同的字符组成，则认为这两个字符串 相似 。
\n\n\"abca\" 和 \"cba\" 相似，因为它们都由字符 'a'、'b'、'c' 组成。\"abacba\" 和 \"bcfd\" 不相似，因为它们不是相同字符组成的。请你找出满足字符串 words[i] 和 words[j] 相似的下标对 (i, j) ，并返回下标对的数目，其中 0 <= i < j <= words.length - 1 。
\n\n
示例 1：
\n\n\n输入：words = [\"aba\",\"aabb\",\"abcd\",\"bac\",\"aabc\"]\n输出：2\n解释：共有 2 对满足条件：\n- i = 0 且 j = 1 ：words[0] 和 words[1] 只由字符 'a' 和 'b' 组成。 \n- i = 3 且 j = 4 ：words[3] 和 words[4] 只由字符 'a'、'b' 和 'c' 。 \n\n\n
示例 2：
\n\n\n输入：words = [\"aabb\",\"ab\",\"ba\"]\n输出：3\n解释：共有 3 对满足条件：\n- i = 0 且 j = 1 ：words[0] 和 words[1] 只由字符 'a' 和 'b' 组成。 \n- i = 0 且 j = 2 ：words[0] 和 words[2] 只由字符 'a' 和 'b' 组成。 \n- i = 1 且 j = 2 ：words[1] 和 words[2] 只由字符 'a' 和 'b' 组成。 \n\n\n
示例 3：
\n\n\n输入：words = [\"nba\",\"cba\",\"dba\"]\n输出：0\n解释：不存在满足条件的下标对，返回 0 。\n\n
\n\n
提示：
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"style": "LEETCODE",
"exampleTestcases": "[\"aba\",\"aabb\",\"abcd\",\"bac\",\"aabc\"]\n[\"aabb\",\"ab\",\"ba\"]\n[\"nba\",\"cba\",\"dba\"]",
"__typename": "QuestionNode"
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