{ "data": { "question": { "questionId": "2428", "questionFrontendId": "2352", "boundTopicId": null, "title": "Equal Row and Column Pairs", "titleSlug": "equal-row-and-column-pairs", "content": "

Given a 0-indexed n x n integer matrix grid, return the number of pairs (ri, cj) such that row ri and column cj are equal.

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A row and column pair is considered equal if they contain the same elements in the same order (i.e., an equal array).

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\n

Example 1:

\n\"\"\n
\nInput: grid = [[3,2,1],[1,7,6],[2,7,7]]\nOutput: 1\nExplanation: There is 1 equal row and column pair:\n- (Row 2, Column 1): [2,7,7]\n
\n\n

Example 2:

\n\"\"\n
\nInput: grid = [[3,1,2,2],[1,4,4,5],[2,4,2,2],[2,4,2,2]]\nOutput: 3\nExplanation: There are 3 equal row and column pairs:\n- (Row 0, Column 0): [3,1,2,2]\n- (Row 2, Column 2): [2,4,2,2]\n- (Row 3, Column 2): [2,4,2,2]\n
\n\n

 

\n

Constraints:

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Compiled with clang 11 using the latest C++ 20 standard.

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Most standard library headers are already included automatically for your convenience.

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OpenJDK 17. Java 8 features such as lambda expressions and stream API can be used.

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Python 2.7.12.

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C# 10 with .NET 6 runtime

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Node.js 16.13.2.

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Python 3.10.

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