{ "data": { "question": { "questionId": "1658", "questionFrontendId": "1536", "boundTopicId": null, "title": "Minimum Swaps to Arrange a Binary Grid", "titleSlug": "minimum-swaps-to-arrange-a-binary-grid", "content": "

Given an n x n binary grid, in one step you can choose two adjacent rows of the grid and swap them.

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A grid is said to be valid if all the cells above the main diagonal are zeros.

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Return the minimum number of steps needed to make the grid valid, or -1 if the grid cannot be valid.

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The main diagonal of a grid is the diagonal that starts at cell (1, 1) and ends at cell (n, n).

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Example 1:

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\nInput: grid = [[0,0,1],[1,1,0],[1,0,0]]\nOutput: 3\n
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Example 2:

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\nInput: grid = [[0,1,1,0],[0,1,1,0],[0,1,1,0],[0,1,1,0]]\nOutput: -1\nExplanation: All rows are similar, swaps have no effect on the grid.\n
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Example 3:

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\nInput: grid = [[1,0,0],[1,1,0],[1,1,1]]\nOutput: 0\n
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Constraints:

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Compiled with clang 11 using the latest C++ 17 standard.

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Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.

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

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Python 2.7.12.

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C# 10 with .NET 6 runtime

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Your code is compiled with debug flag enabled (/debug).

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Node.js 16.13.2.

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Ruby 3.1

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Python 3.10.

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