【Leetcode_easy】1128. Number of Equivalent Domino Pairs

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problem 1128. Number of Equivalent Domino Pairs solution1: 不明白为什么每个元素都要加上count: class Solution { public: int numEquivDominoPairs(vector<vector<int>>& dominoes) { ; unordered_map<int, int> count; for(auto d:dominoes) { res += count[mi…

【leetcode】1128. Number of Equivalent Domino Pairs

题目如下: Given a list of dominoes, dominoes[i] = [a, b] is equivalent to dominoes[j] = [c, d] if and only if either (a==c and b==d), or (a==d and b==c) - that is, one domino can be rotated to be equal to another domino. Return the number of pairs (i, j)…

【LeetCode】1128. Number of Equivalent Domino Pairs 等价多米诺骨牌对的数量（Python）

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LeetCode.1128-等价多米诺骨牌对的数量(Number of Equivalent Domino Pairs)

这是小川的第394次更新,第428篇原创 01 看题和准备今天介绍的是LeetCode算法题中Easy级别的第259题(顺位题号是1128).给定多米诺骨牌列表,当且仅当(a == c且b == d)或(a == d且b == c),dominoes[i] = [a,b]等价于dominoes[j] = [c,d],也就是说,一个多米诺骨牌可以旋转到等价于另一个多米诺骨牌. 返回0 <= i < j < dominoes.length,并且dominoes[i]等价于dominoes[…

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